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问题 单项选择题

根据《个体防护装备选用规范》（GB/T11651-2008）中对作业类别的规定：低压带电作业是指额定电压小于（）kv的带电操作作业。

A.2

B.5

C.3

D.1

答案

参考答案：D

补全对话，情景问答

根据对话内容，补全对话。

A: Hi, Peter! Do you know there is a show in Beijing National Art Gallery?

B: 1                        But I don't know what it is about.

A: It's about Chinese history and culture.

B: Great! 2                        I think I can learn a lot there.

A: Would you like to go with me?

B: 3                       But I don't have enough money to buy a ticket.

A: 4                       I have two tickets, and I can give one to you.

B: Thank you. 5                        

A: You're welcome. Let's go.

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单项选择题

关于女性生殖系统的自然防御功能，错误的是（）。

A.两侧大阴唇自然合拢

B. * * 维持酸性环境

C.子宫颈内口紧闭

D.宫颈管黏液栓

E.输卵管黏膜的纤毛向伞端摆动
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