电力系统（），是共同保证实现安全目标密不可分的组织体系。
A、安全保证体系；
B、安全监察体系；
C、安全保证体系和安全监察体系；
参考答案：C
用所给词的正确形式填空。
1. This woman is _________ (Li Lei) mother.
2. The boy is _________ (cry) now.
3. Would you like some _________ (banana)?
4. I can see two _________ (woman).
5. I can see many _________ (people).
6. I'd like three _________ (bottle) of water.
7. May I have some _________ (grape)?
8. The boys and girls are _________ (child).
9. She is _________ (play) with the baby.
10. The man is _________ (read) a book.
下列哪一项可诊断为闭经？（）
A.月经一年一行，无其他不适
B.月经三月一行，无其他不适
C.月经停闭半年，小腹隆起，脉滑利
D.既往月经后期，现6月未行
E.产后半年尚未行经
