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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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weighing by handD
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reading the gage pressureB
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