單項選擇題（）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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1.單項選擇題Each fire drill shall not include（）.
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
2.單項選擇題Which instrument is used to measure the relative humidity of air?（）
A.Hydrometer
B.Hygrometer
C.Spectrometer
D.Barometer
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