单项选择题

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

A.remove oxygen from the area
B.cool fuel below ignition temperature
C.smother with CO₂
D.smother fire with foam

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单项选择题

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

A.spray directly on the base of the fire
B.flow the foam down a nearby vertical surface
C.sweep the fire with the foam
D.spray directly on the surface of the fire

单项选择题

The atmosphere in a tank is too lean if it is（）.

A.incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)
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