单项选择题
A fire starts on your vessel while refueling. You should FIRST（）.
A.stop the ventilation
B.sound the general alarm
C.determine the source of the fire
D.attempt to extinguish the fire
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A combination or all-purpose nozzle produces（）.
A.low-velocity fog only
B.a solid stream only
C.a solid stream and foam
D.a solid stream and fog -
单项选择题
A CO2 portable extinguisher is annually checked by（）.
A.reading the gage pressure
B.weighing the extinguisher
C.discharging a small amount of CO2
D.seeing if the seal has been broken -
单项选择题
A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.
A.used at the earliest opportunity
B.hydrotested
C.recharged
D.weighed again in one month
