单项选择题
ECDIS should be capable of（）all chart information necessary for safe and efficient navigation originated.
A.Exhibiting
B.Existing
C.Demonstrating
D.Displaying
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（）is main emergency fire system in all merchant ships.
A.CO2 system
B.Foam system
C.Dry power system
D.Water supply system -
单项选择题
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 -
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Which instrument is used to measure the relative humidity of air?（）
A.Hydrometer
B.Hygrometer
C.Spectrometer
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