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Which is the proper method of determining whether a portable CO₂ fire extinguisher needs recharging?（）
A:Check the tag to see when the extinguisher was last charged
B:Release a small amount of CO₂; if the CO₂ discharges，the extinguisher is acceptable
C:Weigh the extinguisher and compare the weight against that stamped on the valve
D:Recharge the extinguisher at least once each year

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出自：海船船员证

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