单项选择题

The bilge pump on a fishing vessel（）.

A.must be fixed if the vessel exceeds 12 meters in length
B.may be used as a fire pump
C.must be portable if there are more than 4 watertight compartments
D.must be capable of pumping at least 450 gpm

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The best method of extinguishing a class A fire is to（）.

A.remove oxygen from the area
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C.smother with CO₂
D.smother fire with foam

单项选择题

The BEST method of applying foam to a fire is to（）.

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B.capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)
C.capable of supporting a fire once started
D.not safe for ballasting