单项选择题
The certificate for the refrigerating plant will（）soonI’d like to extend its validation now.
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C.outdated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
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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
