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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Using a file without a handle may result in （）
Which of the following items don’t belong to dock repair works?（）
Under MARPOL Code the ship to which it applies has to carry （）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
The main purpose of port State control is not to（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
The shipboard oil pollution emergency plan will be invalid after （）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）