When must a dry chemical fire extinguisher be recharged?（）<br>A:After each use<br>B:When the air temperature exceeds 90°F<br>C:Every 6 months<br>D:Every 12 months

When must a dry chemical fire extinguisher be recharged?（）
A:After each use
B:When the air temperature exceeds 90°F
C:Every 6 months
D:Every 12 months

出自：海船船员证

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