问题 单项选择题

对超压或欠压切断的切断阀,缓慢地提高可控辅助压力,记录下超压切断压力值,再将压力恢复至调压阀设定点,并使切断阀复位,然后缓慢降低可控辅助压力,检查()切断压力.

A.截断阀

B.欠压

C.超压

D.辅助压力

答案

参考答案:B

阅读理解

阅读理解。

     Mrs Smith is going shopping with her son. They are looking for presents for Mr Smith's birthday.

They drive to the shop mall on Baker Street.

     Mrs Smith goes to the Electrical Shop on the third floor. When the woman gets to the counter, she

finds that camera she was going to buy is sold (卖) out. She finds another kind of camera, but it is too

expensive. Then she finds a compact camera. That is a small camera. There is a discount on it. but she

does not know if her husband likes it. So she decides (决定) not to buy that one.

     Tom goes to the Men's Clothing Shop on the first floor. The boy is looking for a jumper for his father

He has only $ 10 in his pocket and it's not enough. Then he waits for his mother to come. At last, they buy the jumper for Mr Smith.

1. What do they want to buy for Mr Smith at first?

A. A camera.       

B. A jumper.

C. A camera and a jumper.

D. They don't decide.

2. What shop does Mrs Smith go to first?

A. The Men's Clothing Shop.   

B. The Women's Clothing Shop.

C. The Camera Shop.         

D. The Electrical Shop.

3. Why doesn't Mrs Smith buy a camera?

A. Because it is sold out.

B. Because it is too expensive.

C. Because her husband may not like it.

D. All the above.

4. What shop does Tom go to?

A. The Women's Clothing Shop.   

B. The Men's Clothing Shop.

C. The Camera Shop.             

D. The Electrical Shop.

5. How much do they have to spend?

A. More than 10 dollars.     

B. Less than 10 dollars.

C. 10 dollars.                

D. 5 dollars.

单项选择题