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急求c语言 dev c++) 利用结构体做一个小系统,为什么直接无法编译运行?

2023-07-23 09:24:27
共2条回复
里论外几

  1. Mistake的定义中k无初值,似乎应该是m<=48||m>=54,k是多余的。

  2. Search2中的t无初值。

  3. Price_ranking中的x无初值,指针p没有初始化,tem没有初始化。

  4. Book中的number没有初值,k没有初值,指针p没有初始化。

错误很多,但都是一个性质的错误:使用没有初始化(或无初值)的变量。其他逻辑是否有误未考。

Chen

调用mistake函数,不需要加上void

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2023-07-23 05:53:371

如何查询一部电影在IMDB中的具体排名?

环球电影资料库里有,几乎所有的电影资料都能在上面找到.也有IMDB排名.参考资料:http://www.mov6.com/IMDB评分方法IMDB是目前全球互联网中最大的一个电影资料库,里面包括了几乎所有的电影,以及1982年以后的电视剧集。IMDB的资料中包括了影片的众多信息,演员,片长,内容介绍,分级,评论等,就个人买碟而言,很大程度上也是参考IMDB的得分。而IMDB的得分又是如何来的呢?它的可靠性又有多少呢?让我们通过《魔戒1:护戒使者》来做具体分析吧,先看上图:这张图就是魔戒1的所有评分者的分数的一个条状统计图。从中我们可以看到各个分数段的大致比例,比如这儿就可以发现,超过一半的人是打满分的。根据IMDB网站上公布的TOP250评分标准:imdb top 250用的是贝叶斯统计的算法得出的加权分(Weighted Rank-WR),公式如下:weighted rank (WR) = (v ÷ (v+m)) × R + (m ÷ (v+m)) × C其中:R = average for the movie (mean) = (Rating)(是用普通的方法计算出的平均分)v = number of votes for the movie = (votes)(投票人数,需要注意的是,只有经常投票者才会被计算在内,这个下面详细解释)m = minimum votes required to be listed in the top 250 (currently 1250)(进入imdb top 250需要的最小票数,只有三两个人投票的电影就算得满分也没用的)C = the mean vote across the whole report (currently 6.9)(目前所有电影的平均得分)另外重点来了,根据这个注释:note: for this top 250, only votes from regular voters are considered.只有‘regular voters‘的投票才会被计算在IMDB top 250之内,这就是IMDB防御因为某种电影的fans拉票而影响 top 250结果,把top 250尽量限制在资深影迷投票范围内的主要方法。regular voter的标准不详,估计至少是“投票电影超过xxx 部以上”这样的水平,搞不好还会加上投票的时间分布,为支持自己的心爱电影一天内给N百部电影投票估计也不行。因此,细心的人可以注意到,列入IMDB top 250的电影,其主页面上的分数与250列表中的分数是不同的。以魔戒1为例,它在自己的页面[url]http://www.imdb.com/title/tt0120737/[/url]中的分数是8.8,而列表中是8.7。一般 250表中的得分都会低于自己页面中的得分,越是娱乐片差距越大。这大概是因为regular voter对于电影的要求通常较高的关系。
2023-07-23 05:53:451

不少好莱坞动画电影的豆瓣评分远高于imdb评分,是什么原因导致了这一情况?

水军多吧
2023-07-23 05:53:533

求一篇JAMES在NBA获得MVP的英文介绍?

JAMES NBA regular season MVP awardThe NBA regular season individual awards season, the highest honor - the most valuable player (MVP) yesterday go in the "Little Emperor" James name. In this way, the Cavaliers headed into NBA players in the history of the tenth player award in consecutive seasons. Earlier in the award selection, a total of nine players for two consecutive seasons was crowned the regular season MVP. They are superstars Russell, Wilt Chamberlain, Kareem Abdul-Jabbar, Malone, Bird, "Magic" Johnson, Michael Jordan, Tim Duncan and Steve Nash, of which Russell, Chamberlain and Bird superior, had three consecutive seasons of "value the highest. " The same day, James"s University in his hometown of Akron received the blessing of more than 3000 fans. Career when he won the second MVP trophy, the right high school teammates, coaches and his mother, thanked his girlfriend, and finally he invited, including O"Neill, Williams and other Cavaliers teammates came to power, and his share the joy of winning. "My name can be carved on this trophy," James said, "but they paid a lot of teammates." In this season"s regular season, James field team contributions are 29.7 points, 7.3 rebounds, 8.6 assists. In the James led the Cavaliers in the record, following last season ranked full league standings after the first, with 61 wins this season ranks all 21 league negative to the first. James made the selection in a landslide victory, winning total of 123 media workers from the United States and Canada and 116 in the hands of global fans first-place votes, total points over 1205 points. The poll is the second integral thunder team Durant (4 first-place votes), while the Lakers Kobe Bryant points came in third, but he did not get a first-place votes the judges. Orlando ranked fourth star Howard scored three first-place votes. MVP Award this season, a step towards innovation - the first time fans can be voted MVP. Web site by logging NBA fans, selected from five candidates for their own favorite MVP. However, the sum of all the fans to vote the final vote only in the official vote count a ballot paper. Not surprisingly, James has also gained fans to vote first 中文 来源:新华社
2023-07-23 05:54:121

They were the only men who received votes ______me.

选D,意思是他们是除我之外唯一得到选票的人。
2023-07-23 05:54:211

Had Paul received six more votes in the last election,he would have been our chairman now. 改错

很简单:Had Paul received six more votes in the last election,he would be our chairman now.后一个从句指现在,所以虚拟语气只能用would be,而不是用于过去时的would have been.保证答案正确,请及时采纳.祝学习...
2023-07-23 05:54:281

django项目 makemigrations时出现django.db.migrations.graph.nodenotfounderror错误。

1. 创建项目运行下面命令就可以创建一个 django 项目,项目名称叫 mysite :$ django-admin.py startproject mysite创建后的项目目录如下:mysite├── manage.py└── mysite ├── __init__.py ├── settings.py ├── urls.py └── wsgi.py1 directory, 5 files说明:__init__.py :让 Python 把该目录当成一个开发包 (即一组模块)所需的文件。 这是一个空文件,一般你不需要修改它。manage.py :一种命令行工具,允许你以多种方式与该 Django 项目进行交互。 键入python manage.py help,看一下它能做什么。 你应当不需要编辑这个文件;在这个目录下生成它纯是为了方便。settings.py :该 Django 项目的设置或配置。urls.py:Django项目的URL路由设置。目前,它是空的。wsgi.py:WSGI web 应用服务器的配置文件。更多细节,查看 How to deploy with WSGI接下来,你可以修改 settings.py 文件,例如:修改 LANGUAGE_CODE、设置时区 TIME_ZONESITE_ID = 1LANGUAGE_CODE = "zh_CN"TIME_ZONE = "Asia/Shanghai"USE_TZ = True 上面开启了 [Time zone]() 特性,需要安装 pytz:$ sudo pip install pytz2. 运行项目在运行项目之前,我们需要创建数据库和表结构,这里我使用的默认数据库:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, auth, sessionsRunning migrations: Applying contenttypes.0001_initial... OK Applying auth.0001_initial... OK Applying admin.0001_initial... OK Applying sessions.0001_initial... OK然后启动服务:$ python manage.py runserver你会看到下面的输出:Performing system checks...System check identified no issues (0 silenced).January 28, 2015 - 02:08:33Django version 1.7.1, using settings "mysite.settings"Starting development server at Quit the server with CONTROL-C.这将会在端口8000启动一个本地服务器, 并且只能从你的这台电脑连接和访问。 既然服务器已经运行起来了,现在用网页浏览器访问 。你应该可以看到一个令人赏心悦目的淡蓝色 Django 欢迎页面它开始工作了。你也可以指定启动端口:$ python manage.py runserver 8080以及指定 ip:$ python manage.py runserver 0.0.0.0:80003. 创建 app前面创建了一个项目并且成功运行,现在来创建一个 app,一个 app 相当于项目的一个子模块。在项目目录下创建一个 app:$ python manage.py startapp polls如果操作成功,你会在 mysite 文件夹下看到已经多了一个叫 polls 的文件夹,目录结构如下:polls├── __init__.py├── admin.py├── migrations│ └── __init__.py├── models.py├── tests.py└── views.py1 directory, 6 files4. 创建模型每一个 Django Model 都继承自 django.db.models.Model在 Model 当中每一个属性 attribute 都代表一个 database field通过 Django Model API 可以执行数据库的增删改查, 而不需要写一些数据库的查询语句打开 polls 文件夹下的 models.py 文件。创建两个模型:import datetimefrom django.db import modelsfrom django.utils import timezoneclass Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField("date published") def was_published_recently(self): return self.pub_date >= timezone.now() - datetime.timedelta(days=1)class Choice(models.Model): question = models.ForeignKey(Question) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)然后在 mysite/settings.py 中修改 INSTALLED_APPS 添加 polls:INSTALLED_APPS = ( "django.contrib.admin", "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "polls",)在添加了新的 app 之后,我们需要运行下面命令告诉 Django 你的模型做了改变,需要迁移数据库:$ python manage.py makemigrations polls你会看到下面的输出日志:Migrations for "polls": 0001_initial.py: - Create model Choice - Create model Question - Add field question to choice你可以从 polls/migrations/0001_initial.py 查看迁移语句。运行下面语句,你可以查看迁移的 sql 语句:$ python manage.py sqlmigrate polls 0001输出结果:BEGIN;CREATE TABLE "polls_choice" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(200) NOT NULL, "pub_date" datetime NOT NULL);CREATE TABLE "polls_choice__new" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));INSERT INTO "polls_choice__new" ("choice_text", "votes", "id") SELECT "choice_text", "votes", "id" FROM "polls_choice";DROP TABLE "polls_choice";ALTER TABLE "polls_choice__new" RENAME TO "polls_choice";CREATE INDEX polls_choice_7aa0f6ee ON "polls_choice" ("question_id");COMMIT;你可以运行下面命令,来检查数据库是否有问题:$ python manage.py check再次运行下面的命令,来创建新添加的模型:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, polls, auth, sessionsRunning migrations: Applying polls.0001_initial... OK总结一下,当修改一个模型时,需要做以下几个步骤:修改 models.py 文件运行 python manage.py makemigrations 创建迁移语句运行 python manage.py migrate,将模型的改变迁移到数据库中你可以阅读 django-admin.py documentation,查看更多 manage.py 的用法。创建了模型之后,我们可以通过 Django 提供的 API 来做测试。运行下面命令可以进入到 python shell 的交互模式:$ python manage.py shell下面是一些测试:>>> from polls.models import Question, Choice # Import the model classes we just wrote.# No questions are in the system yet.>>> Question.objects.all()[]# Create a new Question.# Support for time zones is enabled in the default settings file, so# Django expects a datetime with tzinfo for pub_date. Use timezone.now()# instead of datetime.datetime.now() and it will do the right thing.>>> from django.utils import timezone>>> q = Question(question_text="What"s new?", pub_date=timezone.now())# Save the object into the database. You have to call save() explicitly.>>> q.save()# Now it has an ID. Note that this might say "1L" instead of "1", depending# on which database you"re using. That"s no biggie; it just means your# database backend prefers to return integers as Python long integer# objects.>>> q.id1# Access model field values via Python attributes.>>> q.question_text"What"s new?">>> q.pub_datedatetime.datetime(2012, 2, 26, 13, 0, 0, 775217, tzinfo=<UTC>)# Change values by changing the attributes, then calling save().>>> q.question_text = "What"s up?">>> q.save()# objects.all() displays all the questions in the database.>>> Question.objects.all()[<Question: Question object>]打印所有的 Question 时,输出的结果是 [<Question: Question object>],我们可以修改模型类,使其输出更为易懂的描述。修改模型类:from django.db import modelsclass Question(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.question_textclass Choice(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.choice_text接下来继续测试:>>> from polls.models import Question, Choice# Make sure our __str__() addition worked.>>> Question.objects.all()[<Question: What"s up?>]# Django provides a rich database lookup API that"s entirely driven by# keyword arguments.>>> Question.objects.filter(id=1)[<Question: What"s up?>]>>> Question.objects.filter(question_text__startswith="What")[<Question: What"s up?>]# Get the question that was published this year.>>> from django.utils import timezone>>> current_year = timezone.now().year>>> Question.objects.get(pub_date__year=current_year)<Question: What"s up?># Request an ID that doesn"t exist, this will raise an exception.>>> Question.objects.get(id=2)Traceback (most recent call last): ...DoesNotExist: Question matching query does not exist.# Lookup by a primary key is the most common case, so Django provides a# shortcut for primary-key exact lookups.# The following is identical to Question.objects.get(id=1).>>> Question.objects.get(pk=1)<Question: What"s up?># Make sure our custom method worked.>>> q = Question.objects.get(pk=1)# Give the Question a couple of Choices. The create call constructs a new# Choice object, does the INSERT statement, adds the choice to the set# of available choices and returns the new Choice object. Django creates# a set to hold the "other side" of a ForeignKey relation# (e.g. a question"s choice) which can be accessed via the API.>>> q = Question.objects.get(pk=1)# Display any choices from the related object set -- none so far.>>> q.choice_set.all()[]# Create three choices.>>> q.choice_set.create(choice_text="Not much", votes=0)<Choice: Not much>>>> q.choice_set.create(choice_text="The sky", votes=0)<Choice: The sky>>>> c = q.choice_set.create(choice_text="Just hacking again", votes=0)# Choice objects have API access to their related Question objects.>>> c.question<Question: What"s up?># And vice versa: Question objects get access to Choice objects.>>> q.choice_set.all()[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]>>> q.choice_set.count()3# The API automatically follows relationships as far as you need.# Use double underscores to separate relationships.# This works as many levels deep as you want; there"s no limit.# Find all Choices for any question whose pub_date is in this year# (reusing the "current_year" variable we created above).>>> Choice.objects.filter(question__pub_date__year=current_year)[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]# Let"s delete one of the choices. Use delete() for that.>>> c = q.choice_set.filter(choice_text__startswith="Just hacking")>>> c.delete()>>> 上面这部分测试,涉及到 django orm 相关的知识,详细说明可以参考 Django中的ORM。5. 管理 adminDjango有一个优秀的特性, 内置了Django admin后台管理界面, 方便管理者进行添加和删除网站的内容.新建的项目系统已经为我们设置好了后台管理功能,见 mysite/settings.py:INSTALLED_APPS = ( "django.contrib.admin", #默认添加后台管理功能 "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "mysite",)同时也已经添加了进入后台管理的 url, 可以在 mysite/urls.py 中查看:url(r"^admin/", include(admin.site.urls)), #可以使用设置好的url进入网站后台接下来我们需要创建一个管理用户来登录 admin 后台管理界面:$ python manage.py createsuperuserUsername (leave blank to use "june"): adminEmail address:Password:Password (again):Superuser created successfully.总结最后,来看项目目录结构:mysite├── db.sqlite3├── manage.py├── mysite│ ├── __init__.py│ ├── settings.py│ ├── urls.py│ ├── wsgi.py├── polls│ ├── __init__.py│ ├── admin.py│ ├── migrations│ │ ├── 0001_initial.py│ │ ├── __init__.py│ ├── models.py│ ├── templates│ │ └── polls│ │ ├── detail.html│ │ ├── index.html│ │ └── results.html│ ├── tests.py│ ├── urls.py│ ├── views.py└── templates └── admin └── base_site.htm 通过上面的介绍,对 django 的安装、运行以及如何创建视 图和模型有了一个清晰的认识,接下来就可以深入的学习 django 的自动化测试、持久化、中间件、国 际 化等知识。
2023-07-23 05:54:371

求英语语法高手解惑,..题目如下

同意上面对28,29,34的回答。其它有不同看法:30题答案应该为B.otherwise,otherwise是副词,意为“否则的话”,全句意为:他应该是在工作,否则的话是在忙着。如果用else一般跟or的后面,而but的后面常跟otherwise31.全面有having received...,表明此动作在前,故后面不用to have been33.整个句子都是逗号,所以答案应该是which,其它答案均错,从语法上是不成立的。
2023-07-23 05:54:472

IMDB到底是如何评分和排名的?

我这几年下来已经投了快550本电影的票了,不知道算不算regular voters,估计他们看到注册地是中国大陆的就直接无视了
2023-07-23 05:54:552

有一部电影是杨千华和梁朝伟演的,梁朝伟扮演一个算命的人,叫赖料布,请问这部电影叫什么名字

me too
2023-07-23 05:55:055

请问什么是IMDB评分?

IMDB是目前全球互联网中最大的一个电影资料库,里面包括了几乎所有的电影,以及1982年以后的电视剧集。IMDB的资料中包括了影片的众多信息,演员,片长,内容介绍,分级,评论等,就个人买碟而言,很大程度上也是参考IMDB的得分。 而IMDB的得分又是如何来的呢?它的可靠性又有多少呢?让我们通过《魔戒1:护戒使者》来做具体分析吧,先看上图: 这张图就是魔戒1的所有评分者的分数的一个条状统计图。 从中我们可以看到各个分数段的大致比例,比如这儿就可以发现,超过一半的人是打满分的。 根据IMDB网站上公布的TOP250评分标准: imdb top 250用的是贝叶斯统计的算法得出的加权分(Weighted Rank-WR),公式如下: weighted rank (WR) = (v ÷ (v+m)) × R + (m ÷ (v+m)) × C 其中: R = average for the movie (mean) = (Rating) (是用普通的方法计算出的平均分) v = number of votes for the movie = (votes)(投票人数,需要注意的是,只有经常投票者才会被计算在内,这个下面详细解释) m = minimum votes required to be listed in the top 250 (currently 1250) (进入imdb top 250需要的最小票数,只有三两个人投票的电影就算得满分也没用的) C = the mean vote across the whole report (currently 6.9) (目前所有电影的平均得分) 另外重点来了,根据这个注释: note: for this top 250, only votes from regular voters are considered. 只有‘regular voters‘的投票才会被计算在IMDB top 250之内,这就是IMDB防御因为某种电影的fans拉票而影响 top 250结果,把top 250尽量限制在资深影迷投票范围内的主要方法。regular voter的标准不详,估计至少是“投票电影超过xxx 部以上”这样的水平,搞不好还会加上投票的时间分布,为支持自己的心爱电影一天内给N百部电影投票估计也不行。 因此,细心的人可以注意到,列入IMDB top 250的电影,其主页面上的分数与250列表中的分数是不同的。以魔戒1为例,它在自己的页面http://www.imdb.com/title/tt0120737/中的分数是8.8,而列表中是8.7。一般 250表中的得分都会低于自己页面中的得分,越是娱乐片差距越大。这大概是因为regular voter对于电影的要求通常较高的关系。
2023-07-23 05:55:331

share怎么读

山若
2023-07-23 05:55:425

If paul had received six more votes in the last election,he?

A 首先在A和B两个选项中选,因为题目已经确定是虚拟句所以肯定是过去时态,而从句是过去完成时态,主句是表示的"现在",所以就是过去时态了.(根据虚拟句的法则,是过去的事情那么从句就用过去的过去即过去完成时态)而B选项的意思是"本该```"的意思,如:you should have finished your homework before supper.你本该在晚饭前完成作业.,2,a 条件句过去时虚拟语气 主句现代时虚拟语气 结构:would + do,2,A 很简单,用不着一堆语法解释。条件句是对过去的假设,主句是对现在的假设,都是虚拟的,就都按照正常时态倒退一个时态就好了。,2,D,2,答案 是 B 因为是对过去条件的 假设 是虚拟语气句型,2,B,2,选择B,过去将来时,俺是凭语感得出答案的,不用说了,你问问老外,肯定是B 如果paul在上次的投票中得到多于6票的选票,那他现在就应该是我们的主席了 这样看看,选什么?,1,A 这是个混合虚拟语气,从句是对过去的虚拟所以用的是had received,而主句是对现在情况的虚拟(用了时间状语now),所以用的是would be。,0,If paul had received six more votes in the last election,he ______ our chairman now. A.would be B.would have been C.will be D.must have been. 请说出选择的理由. 可是我的语感告诉我是B。 我很难理解A的感觉!
2023-07-23 05:56:041

Lo-Pro的《Fuel》 歌词

歌曲名:Fuel歌手:Lo-Pro专辑:Lo-ProArtist - CatatoniaAlbum - Paper Scissors StoneLyrics - Fuel我爱摇滚和唐慧QQ;1015762832Go tell the captainThere"s no waters leftTo navigateI sailed them all for you...Go tell the engine roomStop stoking up the fireWe"re out of fuel...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...We"ll build new ring roadsTo go nowhere in particularNow you"ve passed your Highway CodeAnd make new inroadsInto plundering the EarthFor some more fuel...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...Go ask the GovernmentYou voted in on trustWhere is our fuel?...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...http://music.baidu.com/song/8045620
2023-07-23 05:56:391

几道英语选折题 帮帮忙

A B D B A A C B应该是这样的吧!^-^
2023-07-23 05:56:493

如何创建一个Django网站

本文演示如何创建一个简单的 django 网站,使用的 django 版本为1.7。1. 创建项目运行下面命令就可以创建一个 django 项目,项目名称叫 mysite :$ django-admin.py startproject mysite创建后的项目目录如下:mysite├── manage.py└── mysite ├── __init__.py ├── settings.py ├── urls.py └── wsgi.py1 directory, 5 files说明:__init__.py :让 Python 把该目录当成一个开发包 (即一组模块)所需的文件。 这是一个空文件,一般你不需要修改它。manage.py :一种命令行工具,允许你以多种方式与该 Django 项目进行交互。 键入python manage.py help,看一下它能做什么。 你应当不需要编辑这个文件;在这个目录下生成它纯是为了方便。settings.py :该 Django 项目的设置或配置。urls.py:Django项目的URL路由设置。目前,它是空的。wsgi.py:WSGI web 应用服务器的配置文件。更多细节,查看 How to deploy with WSGI接下来,你可以修改 settings.py 文件,例如:修改 LANGUAGE_CODE、设置时区 TIME_ZONESITE_ID = 1LANGUAGE_CODE = "zh_CN"TIME_ZONE = "Asia/Shanghai"USE_TZ = True 上面开启了 [Time zone](https://docs.djangoproject.com/en/1.7/topics/i18n/timezones/) 特性,需要安装 pytz:$ sudo pip install pytz2. 运行项目在运行项目之前,我们需要创建数据库和表结构,这里我使用的默认数据库:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, auth, sessionsRunning migrations: Applying contenttypes.0001_initial... OK Applying auth.0001_initial... OK Applying admin.0001_initial... OK Applying sessions.0001_initial... OK然后启动服务:$ python manage.py runserver你会看到下面的输出:Performing system checks...System check identified no issues (0 silenced).January 28, 2015 - 02:08:33Django version 1.7.1, using settings "mysite.settings"Starting development server at http://127.0.0.1:8000/Quit the server with CONTROL-C.这将会在端口8000启动一个本地服务器, 并且只能从你的这台电脑连接和访问。 既然服务器已经运行起来了,现在用网页浏览器访问 http://127.0.0.1:8000/。你应该可以看到一个令人赏心悦目的淡蓝色 Django 欢迎页面它开始工作了。你也可以指定启动端口:$ python manage.py runserver 8080以及指定 ip:$ python manage.py runserver 0.0.0.0:80003. 创建 app前面创建了一个项目并且成功运行,现在来创建一个 app,一个 app 相当于项目的一个子模块。在项目目录下创建一个 app:$ python manage.py startapp polls如果操作成功,你会在 mysite 文件夹下看到已经多了一个叫 polls 的文件夹,目录结构如下:polls├── __init__.py├── admin.py├── migrations│ └── __init__.py├── models.py├── tests.py└── views.py1 directory, 6 files4. 创建模型每一个 Django Model 都继承自 django.db.models.Model在 Model 当中每一个属性 attribute 都代表一个 database field通过 Django Model API 可以执行数据库的增删改查, 而不需要写一些数据库的查询语句打开 polls 文件夹下的 models.py 文件。创建两个模型:import datetimefrom django.db import modelsfrom django.utils import timezoneclass Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField("date published") def was_published_recently(self): return self.pub_date >= timezone.now() - datetime.timedelta(days=1)class Choice(models.Model): question = models.ForeignKey(Question) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)然后在 mysite/settings.py 中修改 INSTALLED_APPS 添加 polls:INSTALLED_APPS = ( "django.contrib.admin", "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "polls",)在添加了新的 app 之后,我们需要运行下面命令告诉 Django 你的模型做了改变,需要迁移数据库:$ python manage.py makemigrations polls你会看到下面的输出日志:Migrations for "polls": 0001_initial.py: - Create model Choice - Create model Question - Add field question to choice你可以从 polls/migrations/0001_initial.py 查看迁移语句。运行下面语句,你可以查看迁移的 sql 语句:$ python manage.py sqlmigrate polls 0001输出结果:BEGIN;CREATE TABLE "polls_choice" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(200) NOT NULL, "pub_date" datetime NOT NULL);CREATE TABLE "polls_choice__new" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));INSERT INTO "polls_choice__new" ("choice_text", "votes", "id") SELECT "choice_text", "votes", "id" FROM "polls_choice";DROP TABLE "polls_choice";ALTER TABLE "polls_choice__new" RENAME TO "polls_choice";CREATE INDEX polls_choice_7aa0f6ee ON "polls_choice" ("question_id");COMMIT;你可以运行下面命令,来检查数据库是否有问题:$ python manage.py check再次运行下面的命令,来创建新添加的模型:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, polls, auth, sessionsRunning migrations: Applying polls.0001_initial... OK总结一下,当修改一个模型时,需要做以下几个步骤:修改 models.py 文件运行 python manage.py makemigrations 创建迁移语句运行 python manage.py migrate,将模型的改变迁移到数据库中你可以阅读 django-admin.py documentation,查看更多 manage.py 的用法。创建了模型之后,我们可以通过 Django 提供的 API 来做测试。运行下面命令可以进入到 python shell 的交互模式:$ python manage.py shell下面是一些测试:>>> from polls.models import Question, Choice # Import the model classes we just wrote.# No questions are in the system yet.>>> Question.objects.all()[]# Create a new Question.# Support for time zones is enabled in the default settings file, so# Django expects a datetime with tzinfo for pub_date. Use timezone.now()# instead of datetime.datetime.now() and it will do the right thing.>>> from django.utils import timezone>>> q = Question(question_text="What"s new?", pub_date=timezone.now())# Save the object into the database. You have to call save() explicitly.>>> q.save()# Now it has an ID. Note that this might say "1L" instead of "1", depending# on which database you"re using. That"s no biggie; it just means your# database backend prefers to return integers as Python long integer# objects.>>> q.id1# Access model field values via Python attributes.>>> q.question_text"What"s new?">>> q.pub_datedatetime.datetime(2012, 2, 26, 13, 0, 0, 775217, tzinfo=<UTC>)# Change values by changing the attributes, then calling save().>>> q.question_text = "What"s up?">>> q.save()# objects.all() displays all the questions in the database.>>> Question.objects.all()[<Question: Question object>]打印所有的 Question 时,输出的结果是 [<Question: Question object>],我们可以修改模型类,使其输出更为易懂的描述。修改模型类:from django.db import modelsclass Question(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.question_textclass Choice(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.choice_text接下来继续测试:>>> from polls.models import Question, Choice# Make sure our __str__() addition worked.>>> Question.objects.all()[<Question: What"s up?>]# Django provides a rich database lookup API that"s entirely driven by# keyword arguments.>>> Question.objects.filter(id=1)[<Question: What"s up?>]>>> Question.objects.filter(question_text__startswith="What")[<Question: What"s up?>]# Get the question that was published this year.>>> from django.utils import timezone>>> current_year = timezone.now().year>>> Question.objects.get(pub_date__year=current_year)<Question: What"s up?># Request an ID that doesn"t exist, this will raise an exception.>>> Question.objects.get(id=2)Traceback (most recent call last): ...DoesNotExist: Question matching query does not exist.# Lookup by a primary key is the most common case, so Django provides a# shortcut for primary-key exact lookups.# The following is identical to Question.objects.get(id=1).>>> Question.objects.get(pk=1)<Question: What"s up?># Make sure our custom method worked.>>> q = Question.objects.get(pk=1)# Give the Question a couple of Choices. The create call constructs a new# Choice object, does the INSERT statement, adds the choice to the set# of available choices and returns the new Choice object. Django creates# a set to hold the "other side" of a ForeignKey relation# (e.g. a question"s choice) which can be accessed via the API.>>> q = Question.objects.get(pk=1)# Display any choices from the related object set -- none so far.>>> q.choice_set.all()[]# Create three choices.>>> q.choice_set.create(choice_text="Not much", votes=0)<Choice: Not much>>>> q.choice_set.create(choice_text="The sky", votes=0)<Choice: The sky>>>> c = q.choice_set.create(choice_text="Just hacking again", votes=0)# Choice objects have API access to their related Question objects.>>> c.question<Question: What"s up?># And vice versa: Question objects get access to Choice objects.>>> q.choice_set.all()[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]>>> q.choice_set.count()3# The API automatically follows relationships as far as you need.# Use double underscores to separate relationships.# This works as many levels deep as you want; there"s no limit.# Find all Choices for any question whose pub_date is in this year# (reusing the "current_year" variable we created above).>>> Choice.objects.filter(question__pub_date__year=current_year)[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]# Let"s delete one of the choices. Use delete() for that.>>> c = q.choice_set.filter(choice_text__startswith="Just hacking")>>> c.delete()>>> 上面这部分测试,涉及到 django orm 相关的知识,详细说明可以参考 Django中的ORM。5. 管理 adminDjango有一个优秀的特性, 内置了Django admin后台管理界面, 方便管理者进行添加和删除网站的内容.新建的项目系统已经为我们设置好了后台管理功能,见 mysite/settings.py:INSTALLED_APPS = ( "django.contrib.admin", #默认添加后台管理功能 "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "mysite",)同时也已经添加了进入后台管理的 url, 可以在 mysite/urls.py 中查看:url(r"^admin/", include(admin.site.urls)), #可以使用设置好的url进入网站后台接下来我们需要创建一个管理用户来登录 admin 后台管理界面:$ python manage.py createsuperuserUsername (leave blank to use "june"): adminEmail address:Password:Password (again):Superuser created successfully.总结最后,来看项目目录结构:mysite├── db.sqlite3├── manage.py├── mysite│ ├── __init__.py│ ├── settings.py│ ├── urls.py│ ├── wsgi.py├── polls│ ├── __init__.py│ ├── admin.py│ ├── migrations│ │ ├── 0001_initial.py│ │ ├── __init__.py│ ├── models.py│ ├── templates│ │ └── polls│ │ ├── detail.html│ │ ├── index.html│ │ └── results.html│ ├── tests.py│ ├── urls.py│ ├── views.py└── templates └── admin └── base_site.htm 通过上面的介绍,对 django 的安装、运行以及如何创建视 图和模型有了一个清晰的认识,接下来就可以深入的学习 django 的自动化测试、持久化、中间件、国 际 化等知识。
2023-07-23 05:56:581

如何解决Django 1.8在migrate时失败

1. 创建项目运行下面命令就可以创建一个 django 项目,项目名称叫 mysite :$ django-admin.py startproject mysite创建后的项目目录如下:mysite├── manage.py└── mysite├── __init__.py├── settings.py├── urls.py└── wsgi.py1 directory, 5 files说明:__init__.py :让 Python 把该目录当成一个开发包 (即一组模块)所需的文件。 这是一个空文件,一般你不需要修改它。manage.py :一种命令行工具,允许你以多种方式与该 Django 项目进行交互。 键入python manage.py help,看一下它能做什么。 你应当不需要编辑这个文件;在这个目录下生成它纯是为了方便。settings.py :该 Django 项目的设置或配置。urls.py:Django项目的URL路由设置。目前,它是空的。wsgi.py:WSGI web 应用服务器的配置文件。更多细节,查看 How to deploy with WSGI接下来,你可以修改 settings.py 文件,例如:修改 LANGUAGE_CODE、设置时区 TIME_ZONESITE_ID = 1LANGUAGE_CODE = "zh_CN"TIME_ZONE = "Asia/Shanghai"USE_TZ = True 上面开启了 [Time zone](https://docs.djangoproject.com/en/1.7/topics/i18n/timezones/) 特性,需要安装 pytz:$ sudo pip install pytz2. 运行项目在运行项目之前,我们需要创建数据库和表结构,这里我使用的默认数据库:$ python manage.py migrateOperations to perform:Apply all migrations: admin, contenttypes, auth, sessionsRunning migrations:Applying contenttypes.0001_initial... OKApplying auth.0001_initial... OKApplying admin.0001_initial... OKApplying sessions.0001_initial... OK然后启动服务:$ python manage.py runserver你会看到下面的输出:Performing system checks...System check identified no issues (0 silenced).January 28, 2015 - 02:08:33Django version 1.7.1, using settings "mysite.settings"Starting development server at http://127.0.0.1:8000/Quit the server with CONTROL-C.这将会在端口8000启动一个本地服务器, 并且只能从你的这台电脑连接和访问。 既然服务器已经运行起来了,现在用网页浏览器访问 http://127.0.0.1:8000/。你应该可以看到一个令人赏心悦目的淡蓝色 Django 欢迎页面它开始工作了。你也可以指定启动端口:$ python manage.py runserver 8080以及指定 ip:$ python manage.py runserver 0.0.0.0:80003. 创建 app前面创建了一个项目并且成功运行,现在来创建一个 app,一个 app 相当于项目的一个子模块。在项目目录下创建一个 app:$ python manage.py startapp polls如果操作成功,你会在 mysite 文件夹下看到已经多了一个叫 polls 的文件夹,目录结构如下:polls├── __init__.py├── admin.py├── migrations│ └── __init__.py├── models.py├── tests.py└── views.py1 directory, 6 files4. 创建模型每一个 Django Model 都继承自 django.db.models.Model在 Model 当中每一个属性 attribute 都代表一个 database field通过 Django Model API 可以执行数据库的增删改查, 而不需要写一些数据库的查询语句打开 polls 文件夹下的 models.py 文件。创建两个模型:import datetimefrom django.db import modelsfrom django.utils import timezoneclass Question(models.Model):question_text = models.CharField(max_length=200)pub_date = models.DateTimeField("date published")def was_published_recently(self):return self.pub_date >= timezone.now() - datetime.timedelta(days=1)class Choice(models.Model):question = models.ForeignKey(Question)choice_text = models.CharField(max_length=200)votes = models.IntegerField(default=0)然后在 mysite/settings.py 中修改 INSTALLED_APPS 添加 polls:INSTALLED_APPS = ("django.contrib.admin","django.contrib.auth","django.contrib.contenttypes","django.contrib.sessions","django.contrib.messages","django.contrib.staticfiles","polls",)在添加了新的 app 之后,我们需要运行下面命令告诉 Django 你的模型做了改变,需要迁移数据库:$ python manage.py makemigrations polls你会看到下面的输出日志:Migrations for "polls":0001_initial.py:- Create model Choice- Create model Question- Add field question to choice你可以从 polls/migrations/0001_initial.py 查看迁移语句。运行下面语句,你可以查看迁移的 sql 语句:$ python manage.py sqlmigrate polls 0001输出结果:BEGIN;CREATE TABLE "polls_choice" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(200) NOT NULL, "pub_date" datetime NOT NULL);CREATE TABLE "polls_choice__new" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));INSERT INTO "polls_choice__new" ("choice_text", "votes", "id") SELECT "choice_text", "votes", "id" FROM "polls_choice";DROP TABLE "polls_choice";ALTER TABLE "polls_choice__new" RENAME TO "polls_choice";CREATE INDEX polls_choice_7aa0f6ee ON "polls_choice" ("question_id");COMMIT;你可以运行下面命令,来检查数据库是否有问题:$ python manage.py check再次运行下面的命令,来创建新添加的模型:$ python manage.py migrateOperations to perform:Apply all migrations: admin, contenttypes, polls, auth, sessionsRunning migrations:Applying polls.0001_initial... OK总结一下,当修改一个模型时,需要做以下几个步骤:修改 models.py 文件运行 python manage.py makemigrations 创建迁移语句运行 python manage.py migrate,将模型的改变迁移到数据库中你可以阅读 django-admin.py documentation,查看更多 manage.py 的用法。创建了模型之后,我们可以通过 Django 提供的 API 来做测试。运行下面命令可以进入到 python shell 的交互模式:$ python manage.py shell下面是一些测试:>>> from polls.models import Question, Choice # Import the model classes we just wrote.# No questions are in the system yet.>>> Question.objects.all()[]# Create a new Question.# Support for time zones is enabled in the default settings file, so# Django expects a datetime with tzinfo for pub_date. Use timezone.now()# instead of datetime.datetime.now() and it will do the right thing.>>> from django.utils import timezone>>> q = Question(question_text="What"s new?", pub_date=timezone.now())# Save the object into the database. You have to call save() explicitly.>>> q.save()# Now it has an ID. Note that this might say "1L" instead of "1", depending# on which database you"re using. That"s no biggie; it just means your# database backend prefers to return integers as Python long integer# objects.>>> q.id1# Access model field values via Python attributes.>>> q.question_text"What"s new?">>> q.pub_datedatetime.datetime(2012, 2, 26, 13, 0, 0, 775217, tzinfo=<UTC>)# Change values by changing the attributes, then calling save().>>> q.question_text = "What"s up?">>> q.save()# objects.all() displays all the questions in the database.>>> Question.objects.all()[<Question: Question object>]打印所有的 Question 时,输出的结果是 [<Question: Question object>],我们可以修改模型类,使其输出更为易懂的描述。修改模型类:from django.db import modelsclass Question(models.Model):# ...def __str__(self): # __unicode__ on Python 2return self.question_textclass Choice(models.Model):# ...def __str__(self): # __unicode__ on Python 2return self.choice_text接下来继续测试:>>> from polls.models import Question, Choice# Make sure our __str__() addition worked.>>> Question.objects.all()[<Question: What"s up?>]# Django provides a rich database lookup API that"s entirely driven by# keyword arguments.>>> Question.objects.filter(id=1)[<Question: What"s up?>]>>> Question.objects.filter(question_text__startswith="What")[<Question: What"s up?>]# Get the question that was published this year.>>> from django.utils import timezone>>> current_year = timezone.now().year>>> Question.objects.get(pub_date__year=current_year)<Question: What"s up?># Request an ID that doesn"t exist, this will raise an exception.>>> Question.objects.get(id=2)Traceback (most recent call last):...DoesNotExist: Question matching query does not exist.# Lookup by a primary key is the most common case, so Django provides a# shortcut for primary-key exact lookups.# The following is identical to Question.objects.get(id=1).>>> Question.objects.get(pk=1)<Question: What"s up?># Make sure our custom method worked.>>> q = Question.objects.get(pk=1)# Give the Question a couple of Choices. The create call constructs a new# Choice object, does the INSERT statement, adds the choice to the set# of available choices and returns the new Choice object. Django creates# a set to hold the "other side" of a ForeignKey relation# (e.g. a question"s choice) which can be accessed via the API.>>> q = Question.objects.get(pk=1)# Display any choices from the related object set -- none so far.>>> q.choice_set.all()[]# Create three choices.>>> q.choice_set.create(choice_text="Not much", votes=0)<Choice: Not much>>>> q.choice_set.create(choice_text="The sky", votes=0)<Choice: The sky>>>> c = q.choice_set.create(choice_text="Just hacking again", votes=0)# Choice objects have API access to their related Question objects.>>> c.question<Question: What"s up?># And vice versa: Question objects get access to Choice objects.>>> q.choice_set.all()[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]>>> q.choice_set.count()3# The API automatically follows relationships as far as you need.# Use double underscores to separate relationships.# This works as many levels deep as you want; there"s no limit.# Find all Choices for any question whose pub_date is in this year# (reusing the "current_year" variable we created above).>>> Choice.objects.filter(question__pub_date__year=current_year)[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]# Let"s delete one of the choices. Use delete() for that.>>> c = q.choice_set.filter(choice_text__startswith="Just hacking")>>> c.delete()>>> 上面这部分测试,涉及到 django orm 相关的知识,详细说明可以参考 Django中的ORM。5. 管理 adminDjango有一个优秀的特性, 内置了Django admin后台管理界面, 方便管理者进行添加和删除网站的内容.新建的项目系统已经为我们设置好了后台管理功能,见 mysite/settings.py:INSTALLED_APPS = ("django.contrib.admin", #默认添加后台管理功能"django.contrib.auth","django.contrib.contenttypes","django.contrib.sessions","django.contrib.messages","django.contrib.staticfiles","mysite",)同时也已经添加了进入后台管理的 url, 可以在 mysite/urls.py 中查看:url(r"^admin/", include(admin.site.urls)), #可以使用设置好的url进入网站后台接下来我们需要创建一个管理用户来登录 admin 后台管理界面:$ python manage.py createsuperuserUsername (leave blank to use "june"): adminEmail address:Password:Password (again):Superuser created successfully.总结最后,来看项目目录结构:mysite├── db.sqlite3├── manage.py├── mysite│ ├── __init__.py│ ├── settings.py│ ├── urls.py│ ├── wsgi.py├── polls│ ├── __init__.py│ ├── admin.py│ ├── migrations│ │ ├── 0001_initial.py│ │ ├── __init__.py│ ├── models.py│ ├── templates│ │ └── polls│ │ ├── detail.html│ │ ├── index.html│ │ └── results.html│ ├── tests.py│ ├── urls.py│ ├── views.py└── templates└── admin└── base_site.htm
2023-07-23 05:57:061

foreach用法

foreach语句是c#中新增的循环语句,他对于处理数组及集合等数据类型特别方便。foreach语句的一般语法格式如下:foreach(数据类型 标识符 in 表达式){循环体2}。扩展资料:类似的循环语句:for编程中用于循环处理的语句。Java的for语句形式有两种:一种是和C语言中的for语句形式一样,另一种形式用于在集合和数组之中进行迭代。有时候把这种形式称为增强的for(enhanced for)语句,它可以使循环更加紧凑和容易阅读。它的一般形式为: for(;;) 语句; 初始化总是一个赋值语句,它用来给循环控制变量赋初值;条件表达式是一个关系表达式,它决定什么时候退出循环;增量定义循环控制变量每循环一次后按什么方式变化。这三个部分之间用";"分开。参考资料来源:百度百科-for参考资料来源:百度百科-foreach
2023-07-23 05:56:251

门罗主义是什么意思?门罗主义出现的历史背景

“门罗主义”,出自1823年时任美国总统门罗提出的“美洲是美洲人的美洲”宣言,虽几经衍变,但长期是美国对拉美政策内核。“门罗主义”名义上声称美洲是美洲人的美洲,实质是为美国独霸美洲、推行强权政治开路,使其可以在美洲任意行使所谓“国际警察权”,迫使拉美国家按美国意志行事。
2023-07-23 05:56:262

我有Adobe ID的账号,用Adobe的账号登陆behance,就是没办登陆进去,访问被拒绝是什么意思??求解??

第一,你是否在网络地区限制区域。第二,账号问题。最后建议,先看下网络的问题。多百度找几个免费的可以登录的试试(我用的大师助手),如果可以就算了,不行就是账号问题。
2023-07-23 05:56:304

数学家请进

更新1: 为何虚数为复数?而虚数如何应用于真实世界,研究虚数有甚么发现? 虚数 图片参考:baike.baidu/pic/1/11710102544318064 (1)[unreliable figure]∶虚假不实的数位 (2)[imaginary number]∶实数与虚数单位之积 亦即实部为零的复数(如3i) 在数学里,如果有某个数的平方是负数的话,那个数就是虚数了。所有的虚数都是复数。 “虚数”这个名词是17世纪著名数学家笛卡尔创制,因为当时的观念认为这是真实不存在的数位。后来发现虚数可对应平面上的纵轴,与对应平面上横轴的实数同样真实。虚数轴和实数轴构成的平面称复平面 复平面上每一点对应着一个复数。 虚数的符号 1777年瑞士数学家欧拉开始使用符号i=√(-1)表示虚数的单位。而后人将虚数和实数有机地结合起来 写成a+bi形式 (a、b为实数),称为复数。 虚数的历史 由于虚数闯入数的领域时,人们对它的实际用处一无所知,在实际生活中似乎也没有用复数来表达的量,因此,在很长的一段时间里,人们对虚数产生过种种怀疑和误解。笛卡尔称“虚数”的本意是指他是假的;莱布尼兹在西元18世纪初则认为:“虚数是美妙而奇异的神灵隐蔽所,它几乎是既存在又不存在的两栖物。”欧拉尽管在许多地方用了虚数,但又说一切形如√(-1)、√(-2)的数学式都是不可能有的,纯属虚幻的。 欧拉之后,挪威的一个测量学家维塞尔,提出把复数a+bi用平面上的点(a,b)来表示。后来,高斯提出了复平面的概念,终于使复数有了立足之地,也为复数的应用开辟了道路。现在,复数一般用来表示向量(有方向的数量) 这在力学、地图学、航空学中的应用是十分广泛的。虚数越来越显示出其丰富的内容,真是:虚数不虚。 不表示实在数量的数词。如下面例子中的一、三、五、九、百、千、万等数词都是虚数。【例】以一当十|三五成群|千方百计|万紫千红|九牛一毛|龙生九子|三月不知肉味|。 描述虚数 虚数 原作:劳伦斯·马克·莱瑟(阿姆斯壮大西洋州立学院) 翻译:徐国强 虚文自古向空构,艾字如今可倍乘。 所问逢人惊诧甚,生活何处有真能? 嗟哉小试调音放,讶矣大为掌夜灯。 三极管中知用否,交流电路肯咸恒。 凭君漫问荒唐义,负值求根疑窦增。 情类当初听惯耳,事关负数见折肱。 几分繁复融学域,百计联席悦有朋。 但看几何三角地,蓬勃艾草意同承。 Imaginary number 图片参考:upload.wikimedia/ *** /mons/thumb/5/52/Gaussebene_Koordinatendarstellung/180px-Gaussebene_Koordinatendarstellung 图片参考:en. *** /skins-1.5/mon/images/magnify-clip In mathematics an imaginary number (or purely imaginary number) is a plex number whose square is a negative real number. Imaginary numbers were defined in 1572 by Rafael Bombelli. At the time such numbers were thought not to exist much as zero and the negative numbers were regarded by some as fictitious or useless. Many other mathematici were slow to believe in imaginary numbers at first including Descartes who wrote about them in his La Géométrie where the term was meant to be derogatory.[1] Contents 1 Definition 1.1 Corollary 2 Geometric interpretation 3 Applications of imaginary numbers 4 History 5 See also 6 References 7 External links Definition Any plex number z can be written as 图片参考:upload.wikimedia/math/e/7/7/e77e0e682bd347e9e7e1dec878ce8586 where 图片参考:upload.wikimedia/math/6/0/7/607708482f5a2afc26174c21834baad3 is the imaginary unit which has the defined property that: 图片参考:upload.wikimedia/math/4/4/b/44b33da6be905320353c4c1906ac7d29 The number 图片参考:upload.wikimedia/math/b/1/9/b19dfd822e2517400335d53c1556df72 defined by 图片参考:upload.wikimedia/math/4/e/0/4e0de3698dfd4a9ab0032ace23583f6f is the real part of the plex number 图片参考:upload.wikimedia/math/e/d/f/edffd1a73cb003cdba3d07600e9aa8f2 defined by 图片参考:upload.wikimedia/math/3/2/f/32fa1bd11a7cdfce10d45ef678d142a8 is the imaginary part. Although Descartes originally used the term "imaginary number" to mean what is currently meant by the term "plex number" the term "imaginary number" today usually me a plex number with a real part equal to 0 that is a number of the form i y. Zero (0) is the only number that is both real and imaginary. Corollary 图片参考:upload.wikimedia/math/b/0/0/b002b9e332482fd34f834c5b113e6493 图片参考:upload.wikimedia/math/8/3/4/834b498313a7d9d60031a206f2be9222 图片参考:upload.wikimedia/math/1/3/e/13e54d9243a424ab9ded92569cefda7c … and so on. Geometric interpretation Geometrically imaginary numbers are found on the vertical axis of the plex number plane allowing them to be presented orthogonal to the real axis. One way of viewing imaginary numbers is to consider a standard number line positively increasing in magnitude to the right and negatively increasing in magnitude to the left. At 0 on this x-axis draw a y-axis with "positive" direction going up; "positive" imaginary numbers then "increase" in magnitude upwards and "negative" imaginary numbers "decrease" in magnitude downwards. This vertical axis is often called the "imaginary axis" and is denoted 图片参考:upload.wikimedia/math/f/9/d/f9d3b767e53c2f6939003eef8c0690ed or simply Im. In this model multiplication by u2212 1 corresponds to a rotation of 180 degrees about the origin. Multiplication by i corresponds to a 90-degree rotation in the "positive" direction (i.e. counter-clockwise) and the equation i2 = u2212 1 is interpreted as saying that if we apply 2 90-degree rotations about the origin the result is a single 180-degree rotation. Note that a 90-degree rotation in the "negative" direction (i.e. clockwise) also satisfies this interpretation. This reflects the fact that u2212 i also solves the equation x2 = u2212 1 — see imaginary unit. In electrical engineering and related fields the imaginary unit is often written as j to avoid confusion with a changing current traditionally denoted by i. Applications of imaginary numbers ... 参考: Wikipedia 抄wiki而已 有啥意思
2023-07-23 05:56:321

大连海事大学物流工程与管理专业考研经验分享?

2023级开始,大连海事大学物流工程与管理(125604方向)不招生了。
2023-07-23 05:56:191

求WOW中的一些台词。例如:愿圣光护佑着你。

求WOW中的一些台词。例如:愿圣光护佑着你。 1,为了部落 2,为了希尔瓦娜斯的胜利 3,洛克塔 4,记住太阳之井的耻辱 5,你们这是自寻死路 6,集结起来,银色北伐军,伸张正义的时候到了 7,你好~朋友! 8,不要相信活着的人! 9,骄傲会将你送上绝路,来吧凡人,品尝夺灵者的愤怒吧! 10,欢迎参加这场盛宴,我的朋友,来吧,狂欢至死吧! 11,感受死亡之翼赐予我的强大力量吧! 12,沙漠,扬起你的沙砾,遮蔽太阳的光芒吧 13,说得好,但这毫无意义! 求魔兽世界NPC语音 例如为了部落 圣光在护佑着你 天啊,你真高之类的 跪求发往我邮箱287227309@qq。 TNND 以前明明下载了很多的 结果只找到几个了 我发给你了 求生活大爆炸中的一些台词 生活大爆炸每集我都看过,楼上的答案根本不是发生在漫画店的,漫画店店主叫斯图尔特(Stuart),我搜集的经典漫画店台词如下:(已标明集数,全部是英文原版对白) Season 3 / Episode 5: - The Creepy Candy Coating Corollary Wil Wheaton: Did that guy just say "Revenge is a dish best served cold" in Klingon? Stuart: I believe so. Wil Wheaton: What is wrong with him? Stuart: Everyone has a different theory. Season 2 / Episode 22: - The Classified Materials Turbulence Stuart: Here, Sheldon, I pulled the new Hellboy for you. It"s mind-blowing. Sheldon Cooper: Excuse me! Spoiler alert! Stuart: I didn"t spoil anything. Sheldon Cooper: You told me it"s mind-blowing, so my mind is going into it pre-blown, and once a mind is *pre*-blown, it cannot be *re*-blown. Stuart: I"m sorry. Sheldon Cooper: Said the Grinch to Christmas. Season 2 / Episode 22: - The Classified Materials Turbulence Sheldon Cooper: Stuart, have you read the new Flash yet? Stuart: No, I haven"t. Sheldon Cooper: Well, I have, and it will knock your socks off! Good luck getting them back on. Season 2 / Episode 22: - The Classified Materials Turbulence Stuart: Sheldon, here is the new edition of Hellboy. It"s mind blowing. Sheldon: Excuse me. Spoiler alert! Stuart: What? Sheldon: You told me "it"s mind blowing". So my mind goes into it "pre-blown". Once your mind is "pre-blown", it cannot be "re-blown". Stuart: [Bewildered] I"m sorry. Sheldon: Said the Grinch unto Christmas. Season 2 / Episode 20: - The Hofstadter Isoe Penny: What would you remend as a present for a 13-year old boy? Stuart: Um, a 13-year old girl? Season 2 / Episode 20: - The Hofstadter Isoe Stuart: Look Sheldon, it"s late, I"ve gotta get some sleep. Sheldon Cooper: So I win. Stuart: No, I"m tired. Sheldon Cooper: So I win. Stuart: Fine, you win. Sheldon Cooper: Darn tootin" I win. Season 2 / Episode 20: - The Hofstadter Isoe Stuart: You can throw all the French around you want, it doesn"t make you right. Sheldon Cooper: Au contraire. 求动漫《秒数5厘米》中的一些经典台词 贵树同学 要是明年也能一起赏樱花就好了 远野贵树敬启 许久未曾与你联络 虽然我们这里的夏天也很炎热 但跟东京比起来 感觉舒服多了 不过现在想想 我也很喜欢东京闷热的夏季 好似要溶化了一般的柏油路 透过闷热空气望见的高楼大厦 还有像便利店和地铁站里凉到发冷的冷气 我们最后见面 是在小学的毕业典礼上吧 如今已经过去了半年 喂 贵树同学 你还记得我嘛 前略 致贵树同学 感谢你的回信 我很开心 已是深秋 这里的枫叶很美 前天 我把今年先要穿的毛衣拿出来了 最近有社团活动 早上都起得很早 这封信是在电车里写的 前阵子把头发剪了 短到露出了耳朵 要是见面了 你也许都认不出我了 前略 贵树同学 能在3月4日的见面 我真的很开心 已经1年多没有见面了呢 总觉得很紧张 我家附近 有一棵很大的樱花树 到了春天 那边的樱花大概 也会以每秒五厘米的速度飘落吧 我想要是春天能和贵树同学一起赏花就好了 原野桂树: 我深知,这之后我们无法一直守在一起,挡在我们面前的是巨大庞然的人生,阻隔在我们中间的是广阔无际的时间,令我们无能为力 那一瞬间,我似乎明白了,永恒,心灵,灵魂这些东西究竟存于何处。突然间我有种错觉,仿佛在和明里一起分享了自己十三年来的点点滴滴。紧接着,下一刻,我觉得极其难受,因为我已经不知道,该如何去珍惜明里的那份温存,那份情意,该将它们带向何处。我深知,这以后的将来,我们不可能一起走过。对于命途多舛的人生,以及渺茫的时间,阻挡在我们之间这一事实,我们无可奈何。可是,笼罩着我的那份不安,渐渐消逝了,余下的,就只有明里双唇留下的温存…… 明里: 樱花下落的速度,依旧是秒速五厘米。而不论我们之间通过千条简讯,我们之间的距离也不会拉近一厘米…… 玉林成长日记2中的一些台词 我记得希澈的第一句:SMILE~~ wow中的一些疑问 1)什么是威胁值? 人对怪造成的伤害会产生威胁值(就象我拿着刀架在你脖子上一样) 2)什么是仇恨? 仇恨如同威胁值 3)什么是攻击强度?如何根据攻击强度计算伤害值? 攻击强度在人物资料表上有精确计算。每个职业换算的方法不一样 具体体现在力量和敏捷的属性上,你滑鼠移上去就能看到。 4)什么是武器伤害?战士对目标的伤害除了武器伤害外还有什么伤害? 武器伤害是基础。你对怪造成的伤害 除了武器的基础伤害外 还附带技能伤害和攻击强度及暴击的加成。。 5)战士的撕裂技能造成的伤害如何计算? 撕裂的技能上有详细注明,是武器伤害的多少比率。 6)嘲讽的作用是什么? 嘲讽技能上有详细说明。。。 7)战士的嗜血技能造成的伤害如何计算? 嗜血技能上有详细说明。。。。 8)什么是致命一击? 致命一击你可以理解成弱点攻击 简单点来说就是 伤害倍数的加成。。 难道你是初学者战士么。。。有些技能上的东西 在技能列表上就有详细说明 认真看下就能懂了 wow中的一些简语 那我从最详细的说吧。先说魔兽世界(WOW)有2个阵营,部落(BL)和联盟(LM)。但是你玩之前要选择是PVP伺服器还是PVE伺服器,PVP伺服器里BL和LM在中立地图碰到是可以相互打架(PK)的,而PVE伺服器确不行,PVE伺服器里只能在战场(ZC)或者竞技场(JJC)里和不同阵营的玩家PK。目前的这个版本的战场有4个,战歌峡谷(ZG),阿拉希高地(ALX),奥特兰克山脉(AS),风暴之眼(FB).JJC没什么缩写,我就不写了。PVP里的人都比较亢奋,看到其他阵营的一般都开打,比如我就是这样的,所以现在一般有人问你玩WOW偏向哪一个方面有2个回答,喜欢打架(PVP),还有就是PVE(这里的意思是我主要是打FB,一般不PVP,但是不排除PVP和PVE同样喜欢的牛人)。 副本(FB)分为5人FB和团队FB 。FARM副本的意思就是这个FB被你打得快烂掉了,打起来小CASE的,同时有的FB的BOSS很难,你第一次打倒的话就叫FD(first down ),打5人FB和10人团队FB我们叫做刷,打25人FB叫做RAID。 FB难度有2种普通(PT)难度和英雄难度(YX),所以一般你看到的什么PT迷宫啊,YX迷宫啊,前面的字首2个字母表示的是FB的难度模式。YX 难度的FB一般只适合70级的玩家。注意的是只有燃烧的远征(TBC)版本新开出来的FB有2种难度,目前团队FB只有普通难度。之后的资料片巫妖王之怒(WLK)团队FB就会有YX难度。TBC之前的FB也就普通难度1种模式。 现在我为你介绍几个TBC开的FB(以下FB是有YX和PT2种难度的,FB的容易程度由低到高,我帮你分好了) CQ,地狱火城墙,59+(这个59+的意思指这个FB适合59级以及59级以上的的玩家去打) WL,奴隶围栏,60+ XX,鲜血熔炉,61+ ZZ,幽暗沼泽,62+ FL,法力陵墓,64+ 地穴,奥金尼地穴,65+ STK,塞泰克大厅,67+ 9SR,旧希尔斯布莱德丘陵,68+ 迷宫,70+ 监狱,禁魔监狱 18X,也叫18M,18摸,黑暗之门,70 PT,魔导师平台,70 破碎,破碎大厅,70 NY,能源舰,70 ZQ,蒸汽地窟,70 以上是TBC的5人FB,有PT和YX2种模式。下面是TBC的团队FB(都是只适合70级的) KLZ,卡拉赞,10人 ZAM,祖阿曼,10人 GLR,格鲁尔的巢穴,25人,这个FB的最终BOSS也叫格鲁尔(GLR) FB,风暴要塞,25人(有几个缩写是一样的,这个FB就是的,有很多意思,具体情况,具体看) 毒蛇,毒蛇神殿,25人,最终BOSS叫瓦斯其(瓦MM) 海山,海加尔圣山,25人,最终BOSS叫阿克蒙德(AK) BT,黑暗神殿,25人,最终BOSS叫伊利丹·怒风 (DD,蛋哥) SW,太阳井高地,25人,最终BOSS叫基尔加丹(鸡蛋) 上面的就是TBC的团队FB,只有普通难度。以下的是TBC之前的5人FB, TL,通灵学院 58+,5人副本 厄运。厄运之槌 58+,5人副本 黑石塔 58+,5人副本 STSM,斯坦索姆 58+,5人副本 SY,黑石深渊 55+,5人副本 SM,沉没的神庙 49+,5人副本 ZR,祖尔法拉克 46+,5人副本 MLD,玛拉顿 43+,5人副本 ADM,奥达曼 39+,5人副本 XS,血色修道院 34+,5人副本 TDGD,剃刀高地 33+,人副本 TDZZ,剃刀沼泽 25+,5人副本 NMRG,诺莫瑞根 24+,5人副本 监狱,暴风城监狱 24+,5人副本 SY,黑暗深渊 20+,5人副本 YY,影牙城堡 18+,5人副本 SW,死亡矿井 15+,5人副本 AH,哀嚎洞穴 15+,5人副本 NY,怒焰裂谷 10+,5人副本 以上的就是TBC之前的5人FB,难度只有普通1中,以下的就是TBC之前的60人团队FB AQL,安其拉 60,40人团队副本 BWL,黑翼之巢 60,40人团队副本 MC,熔火之心 60,40人团队副本 黑龙MM,奥妮克希亚的巢穴 60,40人团队副本 FX,安其拉废墟 60,25人团队副本 ZUG,祖尔格拉布 60,20人团队副本 以上就是TBC之前的团队FB,也只有普通难度,下面我再介绍点其他的 AFK,暂离,也就是暂时不玩 ADD,就是不需要杀的怪拉如战斗,打FB最恶心的就是ADD,喜欢ADD的人被人BS AOE,用群伤技能打一群怪 buff,增益效果 debuff,与BUFF相对的,负面效果。 DOT,负面效果的一种,对你持续造成伤害 ROLL,出了1件装备,大家都想要,掷点数,谁高谁拿 DKP,一般团队FB的分配方式比较特殊,是靠DKP来拿的,DKP是通过参加公会的团队FB获得的分数,每次参加都会有DKP拿,出装备的时候你想 要就要出DKP分数来竞争。 SH,用你身上所有的DKP来拿一件装备 RL,打团队副本的时候指挥的人叫RL MT,抗怪的人,肉盾,沙包 2T,3T,...和MT一样,第一抗怪沙包叫MT,第2就叫2T,第3就叫3T... OT,仇恨超过抗怪的T,这样会使得怪把目标转向你,打FB最嫉恨就是OT了,千万别OT... DPS,每秒伤害 UT,UT1种聊天工具,很多打团队FB的通过UT来听RL指挥打 国家队,同一伺服器的玩家或是同1UT的人组团一起进入某战场 军装,适合PVP的装备 空降,对方或己方人少时突然有国家队进入 空难,对方或己方国家队突然同时退出战场 滑水,打副本时候不专心,也叫摸鱼 下面是一些职业的简称: 战士(ZS),潜行者(DZ以前版本叫盗贼),圣骑士(QS或SQ), 德鲁伊(XD),萨满(SM),牧师(MS),术士(SS),法师(FS 另外,朋友我建议你在玩魔兽的时候只要看到不懂的术语就立刻M那位玩家什么意思,我最开始也是这样什么都不知道,比如STK(赛特克),XX(鲜血)之类,于是我不懂就问,没过多久所有的简写,术语等等全都知道了 即使我们现在把所有术语写出来你也记不住的,这个是要亲自体验才有印象,况且这些东西太多了根本想不完也写不完的 求圣经中的一些故事 《霸王妖姬》 影片根据圣经故事中大力士参孙的故事改编,美国派拉蒙电影公司1944年出品。影片描述了大力士参孙的故事。上帝赐予大力士参孙无比的神力,并要他牢记力量是来自他的头发。但参孙被娇美无比的狄莱拉所迷惑,在被仇人逮获后断发刨目,并受尽侮辱。当参孙再次见到狄莱拉时,方知自己被人利用而后悔莫及。上帝感到参孙的悔意,再次赋予他神力。在仇人的竞技场上,参孙与狄莱拉合作,施展神力推倒神庙,与所有仇人同归于尽。 ——俞 求翻译英文病例中的一些词啊! C短, PT捡起,、提及,收集,测试 愿圣光保佑你 HolyLight bless you 英国人平时说话根本不会有这么长的语法 就直接短短一句就行了~
2023-07-23 05:56:181

win7 c盘里找不到users,用户里也没有C:UsersAdministratorAppDataLocalMicrosoftWindowsTemporary

一、users这个文件夹就是 ‘用户"二、Administrator是管理员的意思,应该是你使用了自己的账户名。三、appData这个文件夹是隐藏文件夹,需要显示(1)打开我的电脑,选中如下箭头位置:(2)在弹出的文件夹选项中,点击查看,选中‘显示隐藏的文件"扩展资料:隐藏(hide)是一种文件属性,拥有这种属性的文件叫做“隐藏文件”,隐藏文件在默认设置下不能在Windows资源管理器中显示(部分Windows系统的资源管理器在状态栏上会显示“*个对象(加*个隐藏对象)”),如果不做特殊设置就不能进行操作。隐藏文件一般都是保护系统关键文件所用,如果想保护一个私人文件只用隐藏属性一般是没有作用的。
2023-07-23 05:56:171

高分求法律英语翻译

哇靠,这种问题你也问的出~直接到网上下个翻译的软件不就搞定了—————————————— 施主,一切随缘....
2023-07-23 05:56:145