试题与答案

冷库进行融霜时：缓慢开启调节站上的热氨阀向库房排管增加压力，但不得超过（）Pa，如排

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题型：填空题

题目：

冷库进行融霜时：缓慢开启调节站上的热氨阀向库房排管增加压力，但不得超过（）Pa，如排液桶内的氨液达到（）%的液面时，应停止融霜，将排液桶中液氨排走后再进行融霜。

答案：

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题型：阅读理解

阅读理解

     When you cut your skin, you bleed(流血). If a person loses a lot of blood, he will become ill and may die. Blood is

very important. People have always known that. At one time, some people even drank blood to make them strong!

     When doctors understand how blood goes around inside the body, they try ways of giving blood to people who

need it. They take blood from the healthy people and give it to people who need it. This is called " blood transfusion"

(输血). The blood goes from the arm of the healthy person into the arm of the sick person.

     But there are two problems. First, it does not always work. Sometimes people die when they have blood transfusion.

Later, doctors find that we do not all have the same kind of blood. There are four groups-O, A, B and AB. We all have

blood of one of these groups. They also find that they can give any kind of blood to people of group AB. But they find

that they must give A-group blood to A-group people and B-group blood to B-group people. I have O-group blood and

the doctor told me that I could give blood to anyone else safely.

     There is another problem. To give blood of the right kind, doctors have to find a person of the right blood group.

Often they can not find a person in time. If they have a way to keep the blood until someone needs it, they can always

have the right kind of blood. At first they find they can keep it in bottles for fifteen to twenty days. They do this by

making it very cold. Then they find how to keep it longer. In the end they find a way of keeping blood for a very long time.

     We call a place where we keep money a "bank". We call a place where we keep blood a "blood bank". One day,

when you grow up, you may decide to give blood to a "blood bank". In this way you may stop someone from dying.

Or perhaps one day you may become ill. You may need blood. The "blood bank" will give it to you.

1. From the passage, we learn that sometimes people die when they have blood transfusions because they_________.

A. are unhealthy people

B. have lost a lot of blood

C. are not given the right kind of blood

D. are AB-group people

2. People set up the "blood bank" so that they can _________.

A. give the right kind of blood to the people who need it in time

B. keep different groups of blood as much as possible

C. make it easier to sell or buy blood

D. keep blood for more than twenty hundred years

3. The writer doesn't talk about ________ in the passage.

A. how important blood is to us

B. the four groups of blood

C. where the blood bank is

D. what "blood transfusion" is

4. Which one is right among the following expressions?

A. If I have AB-group blood, I can give my blood to anyone else safely.

B. If I have B-group blood, I can give my blood to a person with AB-group blood.

C. If I have A- group blood, I can only give my blood to others with the same blood.

D. If I have O-group blood, I can get blood from anyone else safely.

5. The passage mainly tells us_________.

A. some means of keeping the blood

B. something about 4 kinds of human's blood

C. something about blood transfusion

D. all of the above
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