问题 问答题 简答题

简述离心压缩机驱动方式的种类和特点。

答案

参考答案:

除了选用电动机作为离心压缩机的驱动机外,在电网电力相对短缺地区,对于大功率离心压缩机选用热力原动机驱动往往更有利,在远离电网的区域,如边区、农村、山区等,可选用有燃气轮机和汽轮机,汽轮机的运行需要水量应,而在水源紧张地区,燃气轮机则更具有优势。

判断题
阅读理解

If you had only three years left to live, how would you spend your time? It’s a hard question and few of us would even like to think about it. But 18-year-old Huang Ge has to answer this question and he says, “I want to thank the people who have helped me.”

At the age of one, Huang’s mother left the family. Six years later, he was badly ill. He has been using a wheelchair since 9 years old. Doctors said he would only live to 18.After Huang’s story went on TV, hundreds of people sent money to help him. The boy was so moved that he decided to thank every one of them. But he has to be tied to his wheelchair. And the family can only afford a three-wheeled motorcycle(三轮摩托). Since 2003, the father and son have traveled 14,000 kilometers, to 10 provinces, and thanked more than 30 helpers.          

“I am moved by the story of the boy. We need the courage to face death, and we should also show our gratefulness to those who help us,” says an online post on CCTV. com.

小题1:_________, Huang Ge started to use a wheelchair.

A.When he was 9 years old

B.When he was 18 years old

C.When he was 10 years old

D.When he was 6 years old小题2:Huang and his father took a _________to thank the helpers.

A.train

B.ship

C.motorcycle

D.bus小题3:The underlined word “gratefulness” means _______________

A.诚信

B.奉献

C.宽容

D.感谢小题4:Which of the following is NOT true according to the passage?

A.Hundreds of people sent money to help him.

B.Huang Ge’s mother left the family.

C.Huang Ge and his father have thanked more than 30 helpers.

D.Huang Ge was badly ill at the age of one.小题5:Which is the best title for the passage?

A.A Great Success

B.An Interesting Trip

C.A Grateful Heart

D.A TV Show