问题 问答题 论述题

分析盾构机推进压力低的原因。

答案

参考答案:

(1)滤清元件堵塞,油路不畅通;

(2)推进主溢流阀损坏,压力无法调到需要的压力;

(3)推进油泵损坏,无法输出需要的压力;

(4)阀件有内泄露,无法建立起需要的压力;

(5)密封圈老化或断裂,造成泄露,无法建立起需要的压力;

(6)推力油缸内泄露,无法建立起需要的压力。

阅读理解

阅读理解

       One day, my mother and I went shopping at a Chinese supermarket. We found that the crucian carps(鲫鱼)in the seafood counter were very fresh, as a result we chose four crucian carps and handed them

over to the seller. As it would take some time to clean the fish and dispose(处理)of their internal organs (内脏), we decided to look around the other places first. When we came back to the seafood counter, I

asked the seller for my fish. He raised one, which was being cleaned, to let me have a look and tell me he was still working on the fish. I hurriedly said, "Go ahead. Go ahead." I meant for him to go on.

       Unexpectedly, the seller stopped his work, looking at me with puzzled expression, and asked me,

" Go ahead?" "Yes," I said, "go ahead". He pointed at the fish in all seriousness, and repeated very

seriously, "Head?" Paying no more attention to him, I turned back to chat with my mother. Suddenly,

"Bang, bang, bang," was heard from the counter. Quickly, the seller passed the four fish without heads

to me.

       I asked loudly, "Why did you cut all the heads off?" The seller was also very angry and said, "Didn't

you tell me to go ahead again and again?"On hearing what he said I felt funny as well as angry. It turned

out that he considered "go ahead" as "cut the head off". No wonder he asked me several times about it!

       Taking the headless fish home, I became frightened. Wouldn't it be possible that the hairdresser would have cut my head off if I had gone to get my haircut?

1. Where did the story happen?    

A. In China.  

B. On the beach   

C. In a Chinese supermarket    

D. At the hairdresser's

2. What does "Go ahead" mean in this passage?   

A. Cut off the heads of the fish.  

B. Go on to clean the fish.    

C. Continue to walk .         

D. Go around.

3. What does the underlined word "frightened" mean?

A. 开心的

B. 庆幸的

C. 害怕的

D. 无所谓的

4. Why did the seller cut all the heads off?    

A. Because I asked him to do so.    

B. Because he wanted to cut off all the heads.    

C. Because I told him to go ahead again and again.    

D. Because he didn't understand what I said.

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