图是没法发了,就口述一下,点A.B位于直线MN的上方,两点与MN的距离不相等,点A在MN左上方,点B在MN右上方,比A会

物体做匀速运动,其运动方向上的合力必然为0,某同学改用另一和水平方向成某一角度(锐角),也拉着该物体在同一水平上做匀速直线运动,其水平方向的分力必然小于200N,根据合力为0,摩擦力必然等于水平方向的分力.这里还需要的解释的是因为其垂直方向力对物理也有作用,重力-该分力得到的物体对地面压力也会比第一中情况小的,这样摩擦力肯定是小于前一种情况的.

说白了,正多面体只有五种：
正三角形可以拼成正4面体、正8面体和正20面体.
正方形可以拼成正6面体.
正五边形可以拼成正12面体.
可以通过欧拉公式来证明.

的确,碳酸根一定要在碱性条件下共存,而且要强碱性,否则会生成碳酸氢根!相关反应如下：
CO3^2-+ H^+（少量）=HCO3-
CO3^2- + 2H^+ = H2O + CO2↑.
不能共存的主要有氢离子,部分金属阳离子,常见的有钙离子、钡离子、镁离子等.

有一个装置里面装有助燃物,然后助燃物和燃料混在一起燃烧,提供动力

Carrying wate

　　1、（1）要蜇死人的（2）马蜂们将无家可归
　　2、　冒险一捅,挨蜂一蜇　　怕蜂进屋,关门逃跑　　不顾一死,拼命复仇
　　3.因为这只马蜂给“我”留下深刻的印象,它不仅蜇了“我”,它的死又与“我”有关.
　　4.说明了“我”从捅马蜂窝这件事中,心灵受到震撼,思想发生了极大的变化.

不要用眼去看,其实这个是正常的,当你做一件事的时候 周围人做什么就好像是在放电影,对你又产生不了什么影响!所以,你就要学会分配你的大脑,百分之80在工作上 百分之20在周围的注意,最后慢慢适应在达到百分之90 等等!

I can not operating on fabric whit this kind of gradual change color.

The pen can not be used, can you show me another one?

This is life.
You can never be serious to everything

1:Could you please make the balance payment to us after the cargos have reached the terminal port?
2:Because the freight is on your account under FOB term,thus we cannot obtain the Bill f Lading to make payment claim against the presentation of B/L copy
3:We will send you the photos of the cargos after they have reached the terminal port.
4:What is the destination port for this batch of shipment.

请到这里: 下载【2013人教版七年级英语下册mp3.rar】
链接:http://pan.baidu.com/share/link?shareid=882492341&uk=3005788395
密码:uh91

能承受住,那大概在40℃左右

dz=(@z/@x)dx+(@z/@y)dy
其中@z/@x是关于X的偏导数,@z/@y是关于Y的偏导数.

1、∵ x-y=9∴2x-2y=2(x-y)=2*9=182、设剩下x页,得：x+45=2.5x∴ x=303、设环形路长S,那么甲速度为S/60,乙速度为S/45-S/60.相遇后调头,相遇时间=S/（V甲-V乙）=S/（S/60-（S/45-S/60））=1/（1/60-1/45+1/60）=90∴...

If the quantity for this specification fails to reach a whole container,we could not do it,for the thickness is too thin,and the paper on the top of the product is difficult to make.
Do you remember the paper with that I wraped a red card?

解题思路：等效替代法，物理学研究术语，是科学研究中常用的方法之一，是在保证某种效果相同的前提下，将实际的、复杂的物理问题和物理过程转化为等效的、简单的、易于研究的物理问题和物理过程来研究和处理的方法，将复杂的问题简单化．

把象安放到大船上，在水面所达到的地方做上记号，再让船装载其它东西，（称一下这些东西），那么比较就能知道结果了．
曹冲在这一过程中所用到的物理方法是等效替代法．即象安放到大船上和其它东西放到大船上，在水面所达到相同的地方，作用效果相同．
A、伽利略研究自由落体运动时是运用抽象思维、数学推导和科学实验相结合的方法，故A错误；
B、观察桌面微小形变是运用放大法，故B错误；
C、研究合力与分力是运用等效替代法，故C正确；
D、研究匀变速直线运动位移是运用微元法，故D错误；
故选：C．

点评：
本题考点： 物理学史．

考点点评： 等效替代的前提是在保证某种效果相同的前提下进行替代，否则不能等效替代．

和风（抚）细雨 鸟语（鸣）花香
看到下面有人用“拂”,但还是觉得“抚”的意境比较浪漫

你也玩?我看好多的英语大闯关推荐啊.看来我out了.

怎样宽敞的房屋呢?几百人在里面开会,还可以再容人,是这样宽敞的房屋.

怎样美的一幅画呢?湖光山色尽收眼中,韵味美,再无法画出第二幅,是这样美的一幅画.

1I will go by myself
I will go on my own.
I will go alone
2 It prevented us (from) going on.
It kept / stopped us from going on.

因为一个规律只能包含事物的一个面.比如吸烟容易得肺癌,有害健康是一个规律；吸烟可以缓解压力,有利健康是一个规律.规律之所以成为规律,是人定义的结果,人从语义上就把它定死了,所只能是一面.

你这属于基线不平,需要对基线调整之后再分析.
调整基线可以用采集Raman Spectra的仪器软件来处理,或者用Origin处理

0和3.
甲知道和为3,有两种可能,即0+3或1+2,积为0或2.
乙知道积为0.若积为2,只有1*2,他就应该知道和为3,所以积不为2.但0乘以任何数都得0,所以乙无法知道另一个数是几.
因此甲可断定不是1+2,只能是0+3.
还不清楚吗?可能是我表达的问题.
两个数谁也不知道,甲就知道和为3,但他不知道是1和2还是0和3,所以他去对乙说,但乙不知道和是几,因此甲就排除了1和2的可能,因为1和2的乘积是2,难道还有其它两个自然数乘积是2的吗?如果乙知道的那个积为2,他就知道这两个数是几了,对不对?
他们的第二次对话甲只是试探,如果甲事先就知道的话,他们第二段话就没有意义了,也就不会得出第三段的结论了.

你不应该被看到这条信息,这不是你的错.什么上面的句子?语法先不说.没人用ERROR这个词来形容人.ERROR一般指机器执行程序发生很严重的程序性错误,不是用来形容人的.

一般翻译出来的,都需要人工去润色的,机器翻译的肯定比不上人,
象那些古词翻译出来后,肯定就不能看.
这个网站翻译的是速度比较快.

由BC=2,ABCD为等腰梯形,可求得OE=1 由圆中直径所对的圆周角为直角,求出x的值,正的那个,便是OA了.若没有学过相似,你用△ABE和△BEO

http://zhidao.baidu.com/question/113341649.html?si=2

是小学语文题目.问到物理中来了.
描述性的句子,先有问题.突出小的特点.
如：
怎样糊涂的人呢?明明是语文的问题,他却当做物理来问,难倒了一大批人,是这样一个糊涂的人.

怎样好的邻居呢?寒冬酷暑,不间断,帮着我家干活,是这样好的邻居.
怎样乱的屋子呢?书本到处都是,乱糟糟,没有下脚的地,是这样乱的屋子.

EB=AB,BF=BC
△BFE全等于△BCA
同理△BCA全等于△FCD
EF=AC=AD
AE=AB=FD
四边形ADFE为平行四边形
2.若∠A=60度,E.F.A.D在同一直线上 ,不存在平行四边形ADFE.

^__^
我是从高三文走过来的.
打瞌睡说明你还没有真地意识到学习的必要性,考试的紧迫性.如果不是真的集中,喝咖啡也没用,只是在熬时间罢了.复习应该把目光集中到每一具体学科,具体的每一题上.不建议总换,会让自己更烦躁,不过也可能因人而异.
考试的内容即具体学习点儿其实都很固定.见到一次就要学会总结,光记到本上看到就觉得沾沾自喜是不可取的,要记到脑子里.学习要记得静心.
做题给自己看,把时间调整好,高三,该熬就熬,但要有效率地熬.
宝贝儿,拼吧.^--^

1.无色溶液中不存在:Fe3+,Cu2+,Fe3+,MnO4-等.
2.Fe3+和HCO3,碳酸根
Al3+和ALO2-,S2-等
3.络合反应不共存,比如 Fe（SCN)3
4.氧化还原反应：Fe3+和I-,S2-
Fe2+和硝酸根在酸性条件
5.复分解反应不共存：H+和碳酸氢跟离子,碳酸根离子
OH-和铁离子 铜离子
中性溶液中不能有气体,沉淀和水生成的.
这是高考老师给我们总结的~

太少提及

算不出来.
可以给个上界的.
用∫(2->+∞) (2^x)[2^(-2^x)]dx来估算一下.
∫(2->+∞) (2^x)[2^(-2^x)]dx
=(1/ln2)∫(2->+∞) [2^(-2^x)]d(2^x)
=(1/ln2)∫(4->+∞) [2^(-t)]dt
=[-1/(ln2)^2] [2^(-t)] |(4->+∞)
=1/[16(ln2)^2]
那么,原级数+∞) (2^x)[2^(-2^x)]dx=1/[16(ln2)^2]

怎样长的长虫呢?用一个碗恰好可以盖住,在没法盖住第二只.是这样的长虫.

设问
拟人、对比
对比
记叙

你应该买一些作文书看,对比一下你的作文.
注意他怎么开头,结尾,过渡.
我的语文老师一直在强调,如果你的作文
连你自己都没被打动,那更别谈感动老师了.
过年老师忙,恐怕少有能帮你的.
如果你愿意,我们一起讨论.
+q760807534

很高兴为您
我的汤太热,没法喝
My soup is too hot to drink
too...to...太...而不能...
-------------------------------
★倾心解答★愿您满意★
★欢迎追问★敬请采纳★
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综合填空一
根据首字母提示补全单词,完成短文.One day when Tony was crossing the road. A car hit him. He fell down and b 1 his arm.An ambulance(救护车) soon arrived and t 2 him to a hospital. A doctor put the arm in a plaster cast(上石膏). Tony could not move it at all.“You must k 3 your arm in the cast for six weeks.” the doctor said, “That would give the broken arm a c 4 to heal(痊愈).” Six weeks later, Tony went back to the h 5 . The doctor cut the cast w 6 a large saw(锯) and took the arm out of the cast.“Can you move your arm, Tony?” He asked. Tony tried to m 7 his arm. At first it was difficult, but soon he was able to move it a little.“Yes, it’s fine,” He said, “Thanks, doctor.” “It will b 8 as good as usual(像以往一样) soon.” The doctor said, “Just e 9 it a little.”“Will I be able to play the piano?” Tony asked.“Of c 10 you will,” He said.“That is a good news,” Tony said, “I couldn’t play it at all before.”

Keys:
1. broke 2. took 3. keep 4. chance 5. hospital
6. with 7. move 8. be 9. exercise 10. course综合填空二用适当的词完成句子,使短文意思完整.There are 47 different kinds of Kangaroos(袋鼠). The smallest are about a quarter of a meter long. The 1 are taller than a man. Kangaroos have very long strong back 2 . These are used for 3 . They also have 4 strong tails for resting on.Kangaroos’ front legs are 5 shorter, and are almost like arms. Kangaroos’ heads are quite small, but their ears are quite large.

Keys:
1. biggest 2. legs 3. jumping 4. long 5. much综合填空三用方框中单词的正确形式填空,使短文意思完整.(每空不一定只填一词)back, good, happy, something, angry, so, but, treat, surprise, welcome

I went to have a dinner party at the biggest hotel in my hometown today. I was very busy, 1 I had no time to change 2 for dinner. Then I drove there as soon as I could 3 when I walked in, no one 4 me to food or drink.
I got 5 . Then I went 6 home and put on 7 clothes of all. After that, I returned again.
This time, everyone stood up at once 8 me and I had the best table and the best food. I got more 9 than before. I took off my coat, put it in the food and said, “Please eat, my dear coat.” The other people were 10 and asked why.

Keys:
1.so 2.anything 3.but 4.treated 5.unhappy
6.back 7. the best 8.welcome 9. angrier 10. surprised综合填空四用方框中的词的适当形式填空.（一空一词）parent, tell, call, celebrate, together, why, start, after, shop, newspaper Most people buy lots of presents just before Christmas. But some people think we buy too much. They start a special day 1 Buy Nothing Day. They don’t want anyone to go 2 on that day. Buy Nothing Day is on November 29. It is 3 Thanksgiving. Often, before Christmas we see many ads. in 4 and on TV 5 us to “buy, buy, buy!” The idea for Buy Nothing Day 6 in Vancouver, Canada. Now people all over the world 7 Buy Nothing Day. In California, the U.S., 8 and children get 9 to read stories, sing songs and draw pictures. The children talk about 10 they can’t get many toys.

Keys:
1. called 2. shopping 3. after 4. newspapers 5. telling
6. started 7. celebrate 8. parents 9. together 10.why综合填空五根据短文内容用框格内的适当形式填空go, thin, cook, minute, look, eat, take, feel, ask, healthOne day, Mrs. Brown 1 to see the doctor. She said she 2 tired every time after she did the 3 . The doctor 4 over Mrs. Brown for a few 5 , then the doctor said, “I’m afraid you are too fat.” “Too fat?” asked Mrs. Brown. The doctor said Mrs. Brown 6 too much food and she didn’t 7 much exercise. Mrs. Brown 8 the doctor what to do. The doctor said, “If you want to be 9 and keep 10 , you have to eat less food.”
Keys:1.went 2.felt 3.cooking 4.looked 5.minutes6.ate 7.take 8.asked 9.thinner 10.healthier综合填空六用所给词的正确形式填空
finish, important, make, president, be, bad, show, out of, large

Last year an __1__ man came to visit us. He is Russian President Vladimir Putin. Putin was born in st. Petersburg, Russia’s second 2 city, in 1952. He came to office in 2000. Four years later, he was again the __3 .Putin does a good job _4 __ Russia great. People say that he is serious and capable(有能力的). But young Putin wasn’t a top student at all. His student’s books and diaries from 40 years ago show this. At a time when the top mark 5 five, Putin got three for math and science. His art was even 6 , only two. He sometimes, forgot __7 his math homework. Once he forgot to wear school uniform. His teacher had to ask him to get out of the classroom. But Putin did very well in the moral class(品德课). He always got full marks. He also 8 a strong love of Russia at an early age.

Keys:
1.important 2.largest 3.president 4.making
5.was 6.worse 7.to finish 8.showed综合填空七or, slow down, wear, happy, follow, both, take care, side, through, stopTraffic rules are made to keep order on the road. They also help to keep people 1 . The pedestrian has as many rules to 2 as the driver of car. You should walk at the sidewalk or at the 3 of the road. Always look carefully before you walk across the street.If you ride a bike, don’t ride in the middle of the road or run 4 red traffic lights. When you ride a bike with a friend, don’t look around to talk. If you drive, you should 5 at the traffic lights. You must always 6 a seat belt(安全带). Without belts 7 the driver and the passengers may be badly hurt in a sudden accident. Someone may be thrown out through the window You may not need to drive a bus, but 8 if you have to travel in one. Get in or get off a bus only when it has come to a 9 . When it is full, don’t try to get inside 10 you may fall off. Keys:1. happy 2. follow 3. side 4. through 5. slow down6. wear 7. both 8. take care 9. stop 10. or综合填空八
用方框内所给词的适当形式填空.
write, bright, something, into, but
It was Friday that day. The sun was shinning 1 . Mrs. Zhang went to buy a fish in a fish shop. She didn’t know how to cook it. So she asked the shopkeeper 2 down the way of cooking on a piece of paper. Then she put the paper 3 her pocket and left the shop happily with the fish.On her way home, a white cat took the fish away from her and ran away at once. Mrs. Zhang ran after the cat 4 she couldn’t catch it. But suddenly she remembered 5 and laughed. She shouted to the cat loudly, “You don’t know how to cook the fish. The paper is still in my pocket!”

Keys:
1. brightly 2. to write 3. into 4. but 5. some

没发牙的是3粒,发芽的是47粒,总数即为50粒,发芽率为47/50=94%.

硝酸有强氧化性,直接将镁氧化,生成一氧化氮：3Mg+8HNO3==3Mg(NO3)2+2NO+4H2O,另外,如果是浓硝酸的话,生成二氧化氮,如果是极稀的硝酸会生成硝酸铵,硝酸浓度不同,生成的还原产物不同.

真怀念这课文...

我学数乐：8169
乐是9,则乐乘乐=81
所以学是1
学乐乘学乐=19*19=361
所以数是6
数数数学数数学学数学=6661661161
6661661161开根=81619或者8*8=64倒推得
所以我是8

a=e^(lna)
a^i=e^(ilna)
欧拉公式e^(ia)=cosa+isina
a^i=e^(ilna)=cos(lna)+isin(lna)

This cartoon was so funny; it got my son laughing so hard that he couldn't even talk to me.