搜题

【单选题】

Which is the proper method of determining whether a portable CO<sub>2</sub> 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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