问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A