问题 问答题 简答题

速度型压缩机的工作原理?

答案

参考答案:速度型压缩机靠高速旋转的叶轮作用,使气体分子得到巨大的动能,然后在扩压器中急剧降低,使气体动能转化为压力能,即速度转化为压力。

阅读理解

Reading is an activity people enjoy a lot in their free time. Some like reading newspapers, and others enjoy novels or comic books. I like reading about the lives of great poeple. This always gives me a lot of ideas on how to make my own life better.

Great people are remembered not because they were handsome or beautiful, but because they did not give up when their lives were difficult. They used every opportunity to change their lives and make the world better.

One good example is Orville and Wilbur Wright, the two brothers who invented the airplane. The plane has made the world into a small village. Hard work, not good luck, is the reason why the Wright Brothers could invent this convenient machine and become remarkable people. Today we wtil remember them when we see planes in the sky.

When I feel sad, stories of great people always help me feel better. This is why I enjoy reading about great people’s lives.

小题1:What does“This”mean in the first paragraph?

A.Being a great person.

B.Living in a special way.

C.Reading about the lives of great people.

D.Reading newspapers, novels, or comic books.小题2:Which book might the writer be most interested in?

A.How to Build a Strong Plane

B.Ten books That have Made Our World Better

C.Use Every Opportunity to Read in Your Free Time

D.Michael Jordan: The Man Who Changed Basketball History小题3:What does “remarkable”mean in the third paragraph?

A.Nice and polite.

B.Tall and handsome.

C.Special and famous.

D.Lucky and interesting.

填空题