高能电子线的剂量学特点是（） A.随能量增加，皮肤剂量加大 B.

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问题单项选择题

高能电子线的剂量学特点是（）

A.随能量增加，皮肤剂量加大

B.随能量增加，皮肤剂量减小

C.随能量增加，皮肤剂量不变

D.10MeV之后随能量增加，皮肤剂量减小

E.10MeV之后随能量增加，皮肤剂量不变

答案

参考答案：A

填空题

根据首字母提示完成句中所缺的英语单词。

1. They have bikes at a very good p_________ only ￥200.

2. You can buy the shorts for 5 d_________.

3. Cheng Long is a f________ movie star.

4. My classmates often help me. They are f_________ to me.

5. What movie do you like best? My f _________ movie is Titanic.

6. Where's my key? I can't f________ it.

7. Do you know her email a________, Tom? I want to write an email to her.

8. J________ is the first month of the year.

9. We have an Art F_________ each year.

10. We have three m_________ a day.

单项选择题

依据国家有关规定，有权考核发放生产经营单位特种作业人员的特种作业操作资格证书的单位是( )。

A．安全培训机构
B．安全生产监督管理部门
C．劳动保障部门
D．生产经营单位