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【单选题】
某液体在内径为D1的水平管路中稳定流动，其平均流速为u1，当它以相同的体积流量通过等长的内径为D2（D2=D1/2）的管子时，若流体为层流，则压降ΔPf为原来的（）倍。A.
4
B.
8
C.
16
D.
32
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【单选题】-Can I have some meat? -Certainly,just_______. [ ]
A.
take it as you like
B.
eat it as you please
C.
help yourself
D.
help yourself at home
【单选题】听力原文：W: Dan, did you want to see me? M: Oh, yes, Sue, please sit down. We need some help. W: What can I do? M: Look at this schedule. [22] There are four conferences in April. And there aren't enough ...
A.
There are not enough efficient managers.
B.
It lacks in guidelines for new employees.
C.
The conference schedule should change immediately.
D.
It is short of representatives for conferences.
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