单项选择题

（）is main emergency fire system in all merchant ships.

A.CO₂ system
B.Foam system
C.Dry power system
D.Water supply system

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单项选择题

A.Starting of a fire pump
B.Reporting to stations
C.Preparing for the duties described in the muster list
D.Checking of cargo handling equipment

单项选择题

A.Hydrometer
B.Hygrometer
C.Spectrometer
D.Barometer

单项选择题

A.The chief officer
B.The second officer
C.The third officer
D.The PSC officer