井巷低压电网“三大保护”是什么?

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问题:

井巷低压电网“三大保护”是什么?

考点:信号把钩工信号把钩工题库
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Mr. Clark worked in a newspaper, and he did a lot of important and difficult work, but then he began to forget things, and this made his work very difficult. One day he said to himself, “I’m going to go and see Dr. Martin about this.”

He waited in the doctor’s waiting room with the other patients, and then the nurse said to him, “You can go in and see Dr. Martin now”.

“Oh, doctor,” said Mr. Clark, ‘it’s terrible, I can’t remember anything for longer than half a minute, and it’s making my work very difficult. What can I do? Can you help me?”

The doctor said, “When did this start, Mr. Clark?”

“When did what start?” Mr. Clark said.

小题1:_______ made Mr. Clark work very difficult.  

A.Important work

B.Working for a long time

C.Forgetting things

D.Bad condition小题2:_______ go to see Dr. Martin.

A.Mr. Clark himself decided to

B.Mr. Clark’s friend advised him to

C.The nurse asked Mr. Clark to

D.The other patient told Mr. Clark to小题3:A patient is _______ .

A.a person who will die soon

B.a person who is ill

C.a doctor’ s helper

D.a doctor’s friend小题4:Why did Mr. Clark ask Dr. Martin, “When did what start”?Because he forgot__________.

A.the time

B.his illness

C.the doctor

D.the hospital小题5:Which statement is TURE?

A.Mr. Clark didn’t know Mr. Martin before.

B.Mr. Clark should not see the doctor.

C.Mr. Clark could remember things as well as before.

D.Mr. Clark’s illness was serious.

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He majors in ____ engineering and wants to become an expert who designs and makes ____ cars.[ ]

A. electricity; electricity

B. electrical; electrical

C. electrical; electric

D. electric; electrical

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设备运转转速低,应选用黏度()的润滑剂。

A、黏度大

B、黏度小

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