问题 问答题 简答题

高炉鼓风机发生喘振的原因有哪些?

答案

参考答案:

1、启动时:达到额定转速后风机进风阀开启慢或放风门开启太少。

2、运行中:热风炉误操作或逆止阀、送风阀阀板脱落、高炉悬料时突然塌料。

阅读理解

阅读理解。

     One day an old man is selling(卖) a big elephant. A young man comes to the elephant and begins to

look at it slowly. The old man goes up to him and says in his ear," Don't say anything about the elephant

before I sell it.  Then I will give you twenty dollars. "  "All right,"  says the young man. After the old man

sells  the  elephant,   he gives the young man twenty  dollars  and says,  "Now, can you tell me how you

found the  elephant's  bad ears?"  "I didn't find the bad  ears,"  says the young man.  "Then why are you

looking at the elephant slowly?" asks the old man. The young man answers, "Because I have never seen

an elephant before, and I want to know what it looks like. "

l.         the elephant.

A.The young man sells

B. The old man sells

C. Two men sell

D. The old man buys  

2. The young man is looking at the elephant slowly. He wants to find out          .      

A. which foot of the elephant is bad

B. how heavy it is

C. which ear of the elephant is bad

D. what it looks like    

3. The young man              .      

A. knows the elephant has bad ears

B. wants to buy the elephant

C.looks after the elephant

D. gets some money from the old man   

4. The young man                .      

A.is not interested in elephants

B. knows what an elephant looks like

C. has seen some elephants before      

D. has never seen an elephant before 

5. Hearing what the young man said, the old man will  probably (很可能) be  _          .      

A. angry              

B. happy

C. dangerous          

D. hungry

单项选择题