单选题A carbon dioxide fire extinguisher should be recharged（）.Aat least annuallyBwhenever it is below its required weightConly if the extinguisher has been usedDbefore every safety inspection
单选题
A carbon dioxide fire extinguisher should be recharged（）.
A
at least annually
B
whenever it is below its required weight
C
only if the extinguisher has been used
D
before every safety inspection
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