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单选题
After using a C02 portable extinguisher，it should be（）.
A
put back in service if some C02 remains
B
hydrostatically tested
C
retagged
D
recharged
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posting a fire watch in the immediate areaB
providing an extinguisher which is ready for immediate useC
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generatorsB
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put back in service if some CO2 remainsB
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单选题A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.A
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单选题Which portable fire extinguisher should be used on a class C fire on board a vessel?（）A
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单选题A CO2 portable extinguisher is annually checked by（）.A
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Point the horn downB
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weighing by handD
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reading the gage pressureB
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