线路停送电时，应防止线路末端电压超过额定电压的（），持续时间

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问题单项选择题

线路停送电时，应防止线路末端电压超过额定电压的（），持续时间不超过（）

A.1.15倍；45分钟

B.1.15倍；20分钟

C.1.3倍；20分钟

D.1.3倍；45分钟

答案

参考答案：B

填空题

根据句意和首字母完成单词。

1. I think you'd better take your father's a_________.

2. We often take four c_________ in the morning from Monday to Friday.

3. Last Sunday he gave me a pen as a g_________ for my birthday.

4. We often go to the a__________. There are sharks and seals in it.

5. Tina bought a s__________ in the zoo.

6. Toby won a gold prize in the c__________.

7. You should play some o__________ sports in the morning because the air at the moment is clean.

8. —Did you get Wang Fei's a__________.

—Yes, I did. She wrote her name on the cover of my new notebook.

9. It is raining. You had better take an u __________ with you.

10. I want to be a teacher in the f__________.

单项选择题

信息流是商流、物流的（）

A.基础

B.条件

C.先导

D.保证