一飞行器飞行时受到的空气阻力与速度成正比,飞行器以速度v匀速飞行时,发动机的功率

题型:选择题

问题:

一飞行器飞行时受到的空气阻力与速度成正比,飞行器以速度v匀速飞行时,发动机的功率为P.当飞行器速度加倍时(仍然匀速运动),则发动机的功率应增为原来的(  )

A.

B.2倍

C.4倍

D.8倍

考点:平均功率和瞬时功率的区别
题型:选择题

阅读理解。

     根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多

余选项。

      It is said that there are about 40,000 different kinds of jobs in the world.   1  

     "Finding a job" is not the same as "choosing a job". Many young people end up in a job which they

are not suitable for.   2   . Here are a few steps to help you think about jobs which you might enjoy doing

after school or university.

     First, it is important to realize what kind of person you are, which special qualities make you different

from everyone else and what you are interested in.    3   . If you like art and enjoy looking at pictures, that

is an interest. But if you can draw a horse that looks like a horse instead of a big dog, that is a skill.

     Then ask yourself this question: in the following three areas  ? skills with people, skills with information

and skills with things  ? which are your best skills?

     After examining your skills, the next step is research. To find out as many different kinds of jobs as

possible, go to the library and read books, magazines and newspapers.    4  

     Finally, trust your own ideas and your own thinking!   5  

A. It is your own life, so find something that you enjoy doing.

B. Choosing the right one itself is a difficult job.

C. We must know what our ideal jobs are.

D. There is a difference between an interest and a skill.

E. Ask your friends about the work they do.

F. "Chance" may play a more important part than "decision".

G. Your parents may also give you a job offer.

题型:选择题

亚洲第一个获得诺贝尔文学奖的作家是()。

A.川端康成

B.泰戈尔

C.大江健三郎

D.施姆尔·约瑟夫·阿格农

题型:选择题

我国银行间外汇市场采用的外汇标价方法是( )。

A.直接标价法

B.间接标价法

C.美元标价法

D.通用标价法

题型:选择题

《中华人民共和国合同法》规定的无效合同有哪些

题型:选择题

加工条形和祖母绿琢型的钻石不需用()工艺。

A.车钻

B.锯钻

C.劈钻

D.磨钻

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