求助欧几里得

shihaodong2022-10-04 11:39:541条回答

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lihang1999sky 共回答了22个问题 | 采纳率100%
1.点是没有部分的东西
2.线只有长度而没有宽带
3.一线的两端是点
4.直线是它上面的点一样地平放着的线
5.面只有长度和宽带
6.面的边缘是线
7.平面是它上面的线一样地平放着的面
8.平面角是在一平面内但不在一条直线上的两条相交线相互的倾斜度.
9.当包含角的两条线都是直线时,这个角叫做直线角.
10.当一条直线和另一条直线交成邻角彼此相等时,这些角每一个被叫做直角,而且称这一条直线垂直于另一条直线.
11.大于直角的角称为钝角.
12.小于直角的角称为锐角
13.边界是物体的边缘
14.图形是一个边界或者几个边界所围成的
15.圆:由一条线包围着的平面图形,其内有一点与这条线上任何一个点所连成的线段都相等.
16.这个点(指定义15中提到的那个点)叫做圆心.
17.圆的直径是任意一条经过圆心的直线在两个方向被圆截得的线段,且把圆二等分.
18.半圆是直径与被它切割的圆弧所围成的图形,半圆的圆心与原圆心相同.(暂无注释)
19.直线形是由直线围成的.三边形是由三条直线围成的,四边形是由四条直线围成的,多边形是由四条以上直线围成的.
20.在三边形中,三条边相等的,叫做等边三角形;只有两条边相等的,叫做等腰三角形;各边不等的,叫做不等边三角形.
21.此外,在三边形中,有一个角是直角的,叫做直角三角形;有一个角是钝角的,叫做钝角三角形;各边不等的,叫做不等边三角形.
22.在四边形中,四边相等且四个角是直角的,叫做正方形;角是直角,但四边不全相等的,叫做长方形;四边相等,但角不是直角的,叫做菱形;对角相等且对边相等,但边不全相等且角不是直角的,叫做斜方形;其余的四边形叫做不规则四边形.
23.平行直线是在同一个平面内向两端无限延长不能相交的直线.
1年前

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She didn't do her homework last night
am less
求助10^-6.5*10^4.5-10^-6.5 = -3.1622776601684 * 10 -7CF=CA AF=
求助10^-6.5*10^4.5-10^-6.5 = -3.1622776601684 * 10 -7CF=CA AF=CA AB/2
∴a b≥2√ab 1/(a b)≤1/2√ab. A×B={a 2, 2a, a 3, 2a 1
汐茗1年前1
ESSE_ 共回答了18个问题 | 采纳率88.9%
f{x}=lg{2x -3}对比f(-x 5)=—f(x 5)还是—f(x-5)对比M=N=include
求助10^-6.5*10^4.5-10^-6.5 = -3.1622776601684 * 10 -7CF=CA AF=
求助10^-6.5*10^4.5-10^-6.5 = -3.1622776601684 * 10 -7CF=CA AF=CA AB/2
∴a b≥2√ab 1/(a b)≤1/2√ab.A×B={a 2,2a,a 3,2a 1
iamtiny5721年前2
瓶子里的耗子 共回答了18个问题 | 采纳率83.3%
B我们讨论的范围是x
求助英语高手When it is struck, a tuning fork produces an almost pu
求助英语高手
When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.这句为什么用retaining? The mechanism by which brain cells store memories is not clearly understood.为什么在which前有个by?
北级熊1年前3
joeyff 共回答了21个问题 | 采纳率81%
etaining:现在分词作伴随状语,表示这个动作与主句中produce这个动作同时发生,
可以改成:and retains its pitch over a long period of time.
mechanism:在这里是“方法”的意思,等于means,
by the mechanism=by the means,by表示通过.(某种途径)
即:brain cells store memories by some(某种) mechanism (途径)
求助分析英语句子结构及其解释Consequently,we work hard at the task of savin
求助分析英语句子结构及其解释
Consequently,we work hard at the task of saving time.We produce a steady flow of labor-saving devices; we communicate rapidly through faxes,phone calls or emails rather than through personal contacts,which though pleasant,take longer— especially given our traffic-filled streets.We,therefore,save most personal visiting for after-work hours or for social weekend gatherings.
就是这个,特别最后那个长句子因该如何分析语法
猫三狗四弦五1年前3
bluesea514 共回答了17个问题 | 采纳率82.4%
只分析那个长句子.其中which引导了一个状语从句吧,用来修饰动词communicate,表方式.具体表示through personal contacts,在状语从句中做主语.在状从中首先有一个系动词的省略,做which的定语,然后是状语从句的谓语动词take longer,而—之后,则属于状语,修饰谓语动词,表原因.而在此中采用given我猜是表示一种对可能性的判断,属于虚拟语气.而句子中的语气的递进,因果,转折就不细说了.
好久没学英语了,抛砖引玉.
SAT语法求助 OG TEST7 S10 13 同类比较
SAT语法求助 OG TEST7 S10 13 同类比较
If we compare the number of alligators with the Gila monster over time,we see that the alligator is in decline.
B.Comparing the number of alligators and the Gila monster,we see that alligators are
E.A comparison over time of the numbers of alligators and Gila monsters shows that alligators are
同类比较一般不都是要用that of代指比较的对象么,为什么这道题不需要?如果是因为numbers用了复数,那么是只有比较数字的时候可以这么写还是比较其他的东西都可以?
B选项是不是把and改成with,然后在the Gila monster前加that of就可以了?这里Gila monster是不是也要改成复数?
天沟望月1年前1
没你能过 共回答了17个问题 | 采纳率88.2%
 67.If we compare the number of alligators with the Gila monsters over time,we see that the alligator is in decline.
 答案是 A comparison overtime of the numbers of alligators and Gila monsters shows that alligators are
  直接用“comparison”更简洁.同时还是要注意比较的对象.数量必须和数量比.
同类比较一般是要用that of代指比较的对象,这道题就应该是
If we compare the number of alligators with that of Gila monsters over time,we see ..
B选项是把and改成with,然后在Gila monsters前加that of就可以了
这里Gila monster是也要改成复数
如果我们比较短吻鳄与希拉毒蜥随着时间的数量,我们看到,鳄鱼是在下降.
语法填空求助For various reasons,new roads couldn't start working a
语法填空求助
For various reasons,new roads couldn't start working and the ruins of the old buildings ____(expose) to the sun and rain.应该填什么?
我觉得应该是exposing 因为一般填空不填原型 但是明明and前的谓语是start 这个是原形啊
最后 一个句子中可以有两个谓语吗 没有连词的情况下.
林美美1年前3
jimling0 共回答了20个问题 | 采纳率85%
and是并列连词,连接两个句子,也就是两个主谓结构,所以这里的couldn't start和应填的词were exposed是两个不同的谓语,
字母组成单词求助 e,e,o
敬旋1年前1
3232k 共回答了18个问题 | 采纳率83.3%
1 telescope望远镜
2tomorrow明天
3newspaper报纸
4 square.正方形
求助衣服英文吊牌翻译 esterno/outside exterieur/oberstoff exterior 100%
求助衣服英文吊牌翻译 esterno/outside exterieur/oberstoff exterior 100%pelle leather cuir leder
verterey1年前1
Joy411 共回答了14个问题 | 采纳率100%
esterno /外表面100% / oberstoff exterieur pelle cuir leder皮革
GRE填空求助.Belanger dances with an
我是陈颢1年前1
艾薇儿_8023 共回答了24个问题 | 采纳率87.5%
你的问题没有显示完整,但可以明确的一点是,GRE 是能力指向型的考试,GRE 填空尤其典型,它对批判性思维能力的要求是比较高的,只能通过系统学习和训练获得。【推荐视频】GRE 填空中的批判性思维:http://www.***.com/Course/FreeLecture/ShowLecture/1033
求助完形填空For each blank in the following passage,there are four
求助完形填空
For each blank in the following passage,there are four choices given below and marked A,B,C and D.Choose the one that is most suitable and mark your answer by blackening the corresponding letter on the Answer Sheet.
When Pat Jones finished college,she decided she wanted to travel around the world and see as many foreign places as she could _21_ she was young.Pat wanted to visit Latin America first,so she got a job 22_ an English teacher in a school in Bolivia.Pat spoke a little Spanish,_23_ she was able to communicate with her students even when they didn’t know much English.
A sentence she had read somewhere stuck in her mind:if you dream _24_ a foreign language,you have really mastered it.Pat repeated this sentence to her students and hoped that someday she would dream in Spanish and they would dream in English.
One day,one of her worst students came up and explained in Spanish that he had not done his homework.He had 25_ early,and had slept badly.
“What does this have to do with _26_?” Pat demanded.
“I dreamed all night,Miss,Jones,and my dream was in English!”
“In English” Pat was very surprised,since he was such a bad students.She was _27_ secretly jealous.Her dreams were still not in Spanish.But she encouraged her young student,“Well,tell me about your dream.”
“All the people in my dream _28_ English,” the student said,“And all the signs were in English.All the newspapers and magazines and all the TV programs were in English.”
“But that’s wonderful,” said Pat,“What did all the people say to you?”
“I’m _29_,Miss Jones.that’s 30_ I slept so badly.I didn’t understand a word they said.It was a nightmare!”
21.A.as B.while C.if D.since
22.A.for B.of C.as D.like
23.A.and B.but C.so D.yet
24.A.in B.about C.of D.for
25.A.got up B.gone to bed C.fallen asleep D.woken up
26.A.you B.me C.your dream D.your homework
27.A.usually B.seldom C.also D.still
28.A.read B.liked C.spoke D.learned
29.A.shy B.silly C.sorry D.sad
30.A.how B.why C.when D.where
esky1691年前1
奶豆香香 共回答了19个问题 | 采纳率89.5%
BCCABDCCCB
数学函数, 求助,! 求解.,!
数学函数, 求助,! 求解.,!
判断下列各点是否在函数Y=3X的图像上.
1) (1/2,1/3); 2) (-2,-6); 3) (-a,-3a)
青年杂咏1年前3
hkjsj2sn31 共回答了23个问题 | 采纳率91.3%
(1)将(1/2,1/3)代入y=3x得
左边=1/3,右边=3*1/2=3/2
因为左边不等于右边,所以(1/2,1/3)不在y=3x上
(2)将(-2,-6)代入y=3x得
左边=-6,右边=3*(-2)=-6
因为左边等于右边,所以(-2,-6)在y=3x上.
(3)将(-a,-3a)代入y=3x得
左边=-3a,右边=3*(-a)=-3a
因为左边等于右边,所以及(-a,-3a)在y=3x上.
英语句子结构分析求助Yet it is an observation made so frequently that i
英语句子结构分析求助
Yet it is an observation made so frequently that it deserves comment.
mpyeitwqtwv1年前1
呖呖1 共回答了22个问题 | 采纳率86.4%
Yet 【it 主语】【is谓语】【 an observation 表语】【made so frequently 过去分词短语,定语】【that it deserves comment结果状语从句】.
祝你开心如意!
求助英语结构what's the advice a professional would give to graduat
求助英语结构what's the advice a professional would give to graduate?是双主语结构吗?双宾语?还是什么?谢谢
sc6171年前4
mcnjksdfiasudfpo 共回答了20个问题 | 采纳率75%
双宾语
英语语法求助An economical and effcient recycling center is accessi
英语语法求助
An economical and effcient recycling center is accessible to the public,responsive to community needs,and complies with current federal regulations governing waste disposal.
我想问的是末尾的govern为什么以分次形式出现的?为什么不用原型?求救啊
lqcf1年前1
一一一一号 共回答了18个问题 | 采纳率83.3%
用分词是表示 它的作用, 是用来 干什么的.
这个动作是它 ---regulations 主动发出的, 是它的目的, 所以是现在分词
分词, 还有一个名字,叫, 非谓语动词, 因为,它是动词, 却没有做谓语成分.
这个地方不用原型, 是因为它 不做谓语用.
dies动词原形求助
木木57831年前1
mt5ph860 共回答了17个问题 | 采纳率76.5%
die
求助英语高手Studies of the gravity field of the Earth indicate tha
求助英语高手
Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them. yield还有移动的意思么?
目前面6对1年前2
YOUYOU081 共回答了13个问题 | 采纳率76.9%
Yield有以下意思:
vt.
1.生产;尤指
1)生产,生长出(作物),结出(果实):
2)(作为报答而)给予;(作为结果、利润等)产生:
2.[有时作yield oneself]被迫放弃;屈服,投降;放纵;沉湎于,沉溺于(有时与up连用):
3.给予,让与;统一,准予:
4.[古语]付酬;酬报,回报
5.【棒球】失(分)
vi.
1.生产;产生;结果实:
2.放弃;屈服,投降;让步,退让:
3.(对外方)屈从:
4.让位于;被…所取代,失去优先地位、领导权等(常与to连用):
5.(在力量、重压等下)屈曲;倒塌;垮掉(to):
The small chair yielded under his weight.
那个小椅子被他压垮了.
n.
1.生产,出产,收益
2.产量,收益量;产物;劳动报酬;投资利益,利润;税收
3.【财政学】投资实得率,收益率;年收入率
4.【物理学、化学】
1)产量,产额,产率
2)当量(在一次核爆炸中所释放的有效总能量)
所以问句中的含义,应该取vi.的第5个意思:(在力量、重压等下)屈曲;倒塌;垮掉
整句话的翻译可以是:
对地球重力场的研究表明,地壳和地幔在受到其上方不正常的重量时会垮塌.
求助中文翻译Methyl 5-(4-fluorophenylsulfonyloxy)benzimidazole-2-ca
求助中文翻译Methyl 5-(4-fluorophenylsulfonyloxy)benzimidazole-2-carbamate
风铃呓语1年前2
伺机而动的小青蛙 共回答了21个问题 | 采纳率90.5%
5 - (4 - 氟苯基磺酰氧基)苯并咪唑 -2 - 氨基甲酸叔丁酯
只是能帮您翻译,由于外行,也不知是什么东西.
英语求助;the passage tells us that
99987j1年前1
cathring 共回答了12个问题 | 采纳率91.7%
这篇文章告诉我们……
求助意大利语翻译Il bell'umore
飞鸿踏雪7781年前2
weico1 共回答了19个问题 | 采纳率78.9%
有语法错误,不用il, bell‘umore就好了,或者un bell’umore,意思是:好心情

专业意大利语翻译团队为您服务,望能采纳
求助完成以下英文题目,谢谢!Fill in the blanks by using the above words.1.
求助完成以下英文题目,谢谢!

Fill in the blanks by using the above words.

1. Our bodies produce to counteract disease.

2. Please turn the key and then you can open the door.

3. You should have got some for your cut.

4. It is to leave one’s litter in public places.

5. Most of the third world countries can produce advanced missiles now.

6. Many strikes took place when NATO bombed Serbs.

7. A lot of the post-modern writers hold an stance in their writings.

8. In winter drivers in northern part of China have to use in order to set their car in motion.

9. The motor industry has been developing rapidly in recent years and it provides cars with brakes, traction controls and many other devices which we didn’t have before.

10. The Chinese army didn’t have missiles during the anti-Japanese war and could only use guns to fight against the Japanese air raid.

fullmoonbao1年前1
没事逛逛哦 共回答了13个问题 | 采纳率92.3%
antibody
anticlockwise
antiseptic
antisocial
antitank
antiwar
anti-imperialist
antifreeze
antilock
antiaircraft
高二物理求助http://m.mofangge.com/html/qDetail/04/g0/201312/yis9g0
高二物理求助
http://m.mofangge.com/html/qDetail/04/g0/201312/yis9g004232626.html 这道题解题过程看不太懂,垂直于电场线那么静电力不是不做功吗
c2tp1年前5
moogates 共回答了20个问题 | 采纳率90%
犯了典型错误,首先带电粒子进入电场会受到电场力,没有力平衡电场力于是做类似抛物线运动,从电场线方向看作匀加速直线运动.
穿过电场的时间越长,电场力做功越大.设vx=at
初速度变为2倍,初动能为4Ek,穿过的时间变成原来的二分之一,则vx=1/2at,原来电场做功为2Ek,那么现在电场力做功为1/4(2Ek),所以为4.5Ek

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