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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单项选择题

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

After using a C02 portable extinguisher，it should be（）.

After using a C0₂ portable extinguisher，it should be（）.