单项选择题

An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.

A.lack of toxicity
B.the multipurpose extinguishing ability
C.burn-back protection
D.cooling ability

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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
单项选择题
After using a C02 portable extinguisher，it should be（）.

A.put back in service if some C02 remains
B.hydrostatically tested
C.retagged
D.recharged
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