单项选择题

架线电机车巷道允许的风速范围为（）m/s。

A.0.15～4.00
B.0.25～4.00
C.0.25～6.00
D.1～8

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单项选择题
听力原文：M: If I'd only looked earlier, I could have found a better apartment for less money.W: Yes, now that all the students are returning, the only places left are distant and expensive.Q: What is the man's problem?(14)A．He thinks he has been overcharged.B．He doesn't like his neighbor.C．He is unhappy with the present apartments.D．He is forced to move out of his apartment.
A.
W:
B.
Q:
C.He
D.
B．He
E.
C．He
F.
D．He
G.
单项选择题
矿井风流中氨气浓度不超过（）%。

A.0.004
B.0.00025
C.0.0024
D.0.0005
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