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