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
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相关考题
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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 -
单项选择题
A branch line valve of a fire extinguishing system on a ship must be marked with the（）.
A.maximum pressure allowed at that branch
B.name of the space or spaces which it serves
C.date of the last maintenance inspection
D.pressure needed to maintain an effective stream at that point -
单项选择题
（），as the chemical extinguisher agent，should be used for an electric fire.
A.dry chemical or foam
B.foam or soda acid
C.carbon dioxide or foam
D.carbon dioxide or dry chemical
