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

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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

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

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