單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the（）.

A.fire hose might be damaged by cargo operations
B.vessel is in port
C.fire-main system is not charged
D.fire pumps are used for purposes other than supplying water to the fire main