单项选择题
A.lack of toxicity B.the multipurpose extinguishing ability C.burn-back protection D.cooling ability
After using a Halon extinguisher，it should be（）.A.put b...
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
After using a C02 portable extinguisher，it should be（）....
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
Accumulations of oily rags should be（）.A.kept in nonmet...
单项选择题Accumulations of oily rags should be（）.
A.kept in nonmetal containers B.discarded as soon as possible C.cleaned thoroughly for reuse D.kept in the paint locker
