单项选择题
A.contain flammable fumes B.protect firefighters from flames C.prevent flames from entering tanks D.keep flames and sparks from getting out of an engine's exhaust system
A.the paint locker B.spaces open to the atmosphere C.cargo holds D.the engine room
A.penetrates to the bottom of the fire B.is kept saturated with low-velocity water fog C.mixes with the burning fuel oil D.completely covers the top of the burning liquid