飞机固定式氧气瓶通常与机身蒙皮上的一个绿色膜片相连。当绿色膜

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问题单项选择题

飞机固定式氧气瓶通常与机身蒙皮上的一个绿色膜片相连。当绿色膜片被冲掉（破）时，表明：（）.

A.氧气瓶压力正常

B.氧气瓶已经热释压

C.氧气瓶能够正常供氧

D.A和C

答案

参考答案：B

填空题

用所给动词的适当形式填空.

1. It’s important for you_______(read) English in the morning.

2. He likes playing and_______(chat) with others after class.

3. I want_______(play) football with you.

4. My father seldom_______(have) meat.

5. What do we need_______(buy)?

6. Now we need a lot of money_______(go) to school.

7. How often______ he________(write) to his parents?

8. My brother________(not have) lunch at home.

9. He enjoys________(fish) and skating.

10. Thank you very much for________(give) me so much money.

问答题简答题

我国法定职业病有哪些？共几大类？多少种？