单项选择题
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
A high-velocity fog stream can be used in fire fighting...
单项选择题A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.
A.using a 2-1/2 inch hose B.there is an outlet for the smoke and heat C.the fire is totally contained by the ship's structure D.at least two fog streams can be used
