变配电站远动设备在交流电消失后不间断电源维持供电时间应不小于

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问题单项选择题

变配电站远动设备在交流电消失后不间断电源维持供电时间应不小于（），无人值班厂站宜不小于30min。

A.20min

B.30min

C.50min

D.40min

答案

参考答案：A

补全对话，情景问答

1.	— What's the ____________ like today? — It's a ____________ day.
2.	— Excuse me! Can you tell me the ____________ to the hospital? — OK, go straight ahead and turn ____________ at the ____________ corner.
3.	— How does she usually go to school? — She usually ____________ to school ____________ ____________.

多项选择题

家庭教育、学校教育、社区教育三教结合的基本形式有（）

A.互相访问

B.通讯联系

C.家长会

D.教育讲座

E.家庭学校