A.is used to be
B.was used to be
C.used to be
D.was used to
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A.has left
B.had left
C.has been away
D.had been away
A.in
B.to
C.from
D.by
A.stand by
B.stand for
C.stood by
D.stood for
A.to pay attention
B.paying attention
C.pay attention
D.your paying attention
A.operated
B.made
C.run
D.done
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If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
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The shipboard oil pollution emergency plan will be invalid after （）