A.do
B.to do
C.done
D.doing
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A.update
B.finish
C.outdated
D.expire
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
B.Since there be loss of energy by friction
C.Were there no loss of energy by friction
D.Should be no loss of energy by friction
A.The smoother；the greater
B.Smoother；less
C.The rougher；the greater
D.rougher；greater
A.in which
B.on which
C.by which
D.from which
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Using a file without a handle may result in （）
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The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.