A.two
B.three
C.four
D.five
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A.usually
B.commonly
C.exceptional
D.unavoidably
A.An alternator
B.An electric motor
C.A diesel engine
D.A main switchboard
A.Cooling system
B.Alarm system
C.The air conditioning installation
D.The mooring equipment
A.pressure
B.velocity
C.flow rate
D.temperature
A.permissibly
B.permissible
C.no permissible
D.not permissible
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
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