A.update
B.finish
C.outdated
D.expire
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A.Any surge occurs
B.Any surge occurred
C.Should any surge occur
D.Should any surge occurring
A.Were there loss of energy by friction
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A.The smoother；the greater
B.Smoother；less
C.The rougher；the greater
D.rougher；greater
A.in which
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D.from which
A.examined；are not having
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C.had examined；would not have had
D.should examine；would not have
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