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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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

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（），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

A CO2 portable extinguisher is annually checked by（）.

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A CO₂ portable extinguisher is annually checked by（）.