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
Fixed CO2 systems would not be used on crew’s quarters ...
单项选择题Fixed CO2 systems would not be used on crew’s quarters or（）.
A.the paint locker B.spaces open to the atmosphere C.cargo holds D.the engine room
Firefighting foam is only effective when the foam（）.A.p...
单项选择题Firefighting foam is only effective when the foam（）.
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
Fire may be spread by which means?（）.A.Conduction of he...
单项选择题Fire may be spread by which means?（）.
A.Conduction of heat to adjacent surfaces B.Direct radiation C.Convection D.All of the above
