单项选择题

应急电源工作时间，应按生产技术上要求的停车时间考虑，当与自启动的发电机组配合使用时，不宜少于下列哪项数值？

A.5min
B.10min
C.15min
D.30min
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单项选择题
在爆炸性气体环境中，低压电力、照明线路绝缘导线和电缆的额定电压不低于工作电压，且不应低压下列哪项数值？
A.400V
B.500V
C.750V
D.100V
未分类题
听力原文：M: You must be pretty excited about your trip to EuropE.When is it that you're leaving?W: In just three weeks. And I am excited! But there are still a few things I need to do before I go.M: Like what?W: Like renewing my passport, going to the travel agency, buying my plane tickets, and figuring out what to do with my apartment while I'm gonE.M: You're not going to give it up, are you?W: No way! I'll never find another apartment around here! But I don't like the idea of paying three month's rent on an empty apartment, either.M: I don't blame you. Perhaps you could sublet it.W: Yes, but who to?M: Hmm, let me think. Oh, I know, just a person. An old colleague of mine, Jim Thomas is coming here to do some research this summer, from June through August.W: Well, that's exactly when I'll be away. It sounds ideal. As long as the landlord agrees.M: Tell you what. I'll be calling Jim later this week anyway, so I'll mention it to him then.W: Well, thanks, Bill. Let me know what happens. That extra money would really come in handy.What does the woman need to do at the travel agency?A.Purchase her plane ticket.B.Change her plane ticket.C.Pick up a passport application form.D.Arrange for her accommodations in EuropE.
A.M:
B.
M:
C.
M:
D.
W:
E.
W:
F.
M:
G.
W:
H.
What
I.Purchase
J.
B.Change
K.
C.Pick
L.
D.Arrange
M.
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