问题
单项选择题
After using a Halon extinguisher，it should be（）.
A.put back in service if more than 50% of the charge remains
B.repainted
C.discarded
D.recharged
答案
参考答案：D
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After using a Halon extinguisher，it should be（）.
A.put back in service if more than 50% of the charge remains
B.repainted
C.discarded
D.recharged
参考答案：D