问题 问答题 论述题

汽包电接点水位计电极更换时,应做好哪些安全上和技术上的工作?

答案

参考答案:

(1)首先应开好工作票;

(2)将与汽包水位高、低有关的热工保护信号强制好;

(3)隔离电触点水位计测量筒水侧和汽侧的一、二次阀;

(4)打开排污阀,放掉测量筒内的压力;

(5)待测量筒完全冷却后,方可拆卸电极;

(6)新电极更换好后,投用时应缓慢开放二次阀和一次阀,防止应力对电极的损害;

(7)工作结束后,要及时恢复强制信号,终结工作票。

阅读理解

Once there was a parrot on sale in a pet store. It was a beautiful red and blue bird. It sat on a perch ( 横杆 ) in the middle of the store, so that everyone could see it when they came in. The owner was very proud of it and asked a high price for it.  

One day a man went into the store. “ That’s a beautiful bird,” he said to the owner, “ But why is it so expensive? Is it an unusual bird?”

“ No, it’s not very unusual. It’s expensive because it can talk.” the pet store owner said.

“ I see. How can I make it talk?” the man asked.

The owner asked him, “ Do you see those strings ( 细绳 ) tied to each of the bird’s legs?

“ Yes,” the man answered.

“ Well, you pull those strings,” the pet store owner told him. That will make the parrot talk.”

The man asked, “ Do you mind if I try?”

“ Not at all,” the owner said.

The man walked up to the parrot and pulled the string on its left leg. The parrot said, “ Good morning.”

The man pulled the string on the parrot’s right leg. This time the parrot said, “ How are you today?”

“ That’s not very interesting,” said the man. “ Any parrot could do that.” Then he laughed, “ But what would happen if I pulled both strings at the same time?”

“ I’ll fall off my perch, you fool !”the parrot said.

小题1: The parrot was expensive because ________.

A.it was pretty beautiful

B.it could talk with people

C.it was a very unusual bird

D.it was in the middle of the store小题2:The parrot would talk when ________.

A.people came into the pet store

B.it was the pet store owner

C.people said it was beautiful

D.people pulled the strings on its legs小题3: Which is the first sentence that the parrot said to the man?

A.Good morning.

B.How are you?

C.That wasn’t interesting

D.I’ll fall off my perch, you fool!小题4: From the story we know the parrot was ________.

A.kind

B.silly

C.clever

D.crazy小题5: The best title for the passage should be ________.

Unusual Parrot   B. Parrot Talk      C. Silly Man     D. Clever Owner

单项选择题