A.hold；responsibility
B.ask；responsibility
C.hold；responsible
D.require；responsible
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A.do
B.to do
C.done
D.doing
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C.outdated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
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