问题 单项选择题

不属于X线管组件散热方法的是()

A.密封管套,自然散热

B.密封管套,风扇散热

C.闭路油循环风冷散热

D.管套内冷水循环散热

E.空调散热

答案

参考答案:E

阅读理解

阅读理解。

     When you are ill, you must be unhappy because your body becomes hot, and there are pains all over. You don't

want to work; you stay in bed, feeling terrible.

    What makes you ill? It is germs(细菌). Germs are everywhere. They are very small and you can't find them with

your eyes, but you can see them with a microscope. They are very small and there could be hundreds of them on or

in a very small thing.

    Germs are always found in dirty water. When you look at dirty water under the microscope, you will see them in

it. So your parents will not let you drink dirty water.

    Germs are found not only in water. They are also found in air and dust(灰尘). If you cut your finger, and if some

of the dust goes into the finger, it will become big and red, and you will have much pain in it. Sometimes germs will

go into your body and you will have pain everywhere.

1.The writer thinks that you will ________ when you are ill.

A.feel hot                  

B.not want to work

C.not feel happy            

D.A, 3 and C

2.You can see germs ________.

A.when you are ill

B.only when you use a microscope

C.when you cut your finger

D.everywhere around you

3.A microscope is used for ________.

A.making very big things look much smaller

B.making very small things look much bigger

C.helping you see things clearly

D.killing germs

4.Your parents don't let you drink dirty water because ________.

A.water will make you ill

B.there are many germs in it

C.you can see germs in it

D.it will make your finger become big and red

5.The writer talks about ________.

A.how to keep dirty water clean

B.how to take care of your fingers

C.how to find germs

D.what makes you ill

单项选择题 案例分析题