A carbon dioxide fire extinguisher should be recharged（）.<br>A:at least annually<br>B:whenever it is below its required weight<br>C:only if the extinguisher has been used<br>D:before every safety inspection

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

出自：海船船员证

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