A.periodic survey
B.statutory survey
C.additional survey
D.annual survey
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A.2
B.3
C.4
D.1
A.registry
B.ship hull
C.nationality
D.replacing machineries and electric devices
A.surveyor
B.chief engineer
C.captain
D.chief mate
A.Ship Survey Bureau
B.CCS
C.Maritime Safety Administration
D.all of the above
A.starting
B.running
C.running-in
D.direction changing
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
Cold weather starting of a diesel engine may be made easier by（）
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