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【单选题】
流体流动时引起能量损失的主要原因是（）A.
流体的压缩性
B.
流体膨胀性
C.
流体的不可压缩性
D.
流体的粘滞性
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举一反三
【单选题】Doctors evaluate the following about kids EXCEPT
A.
how much TV they watch and what they see.
B.
what video and computer games they play.
C.
which websites they visit on the Interact.
D.
how is their performance at school.
【单选题】What does Ms Chavez say about TV?
A.
The TV business and the newspaper business are similar.
B.
TV will probably be replaced by the Internet.
C.
When it was invented, it didn't end the newspaper business.
【单选题】—What about the concert last night? —___ I might as well have stayed at home and watched TV.
A.
It couldn’t have been any better.
B.
It couldn’t have been any worse.
C.
It was the best one.
D.
There was no better one.
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