单项选择题
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
The best method of extinguishing a class A fire is to（）...
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
The BEST method of applying foam to a fire is to（）.A.sp...
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
The atmosphere in a tank is too lean if it is（）.A.incap...
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
