單項(xiàng)選擇題Foam extinguishes a fire by（）.

A.shutting off the air supply
B.cooling the fuel to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition


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1.單項(xiàng)選擇題Flames from small leaks of LFG may be extinguished by（）.

A.utilizing carbon dioxide or dry chemical fire extinguishers
B.utilizing soda and acid fire extinguishers
C.blowing the flames out
D.letting it burn itself out

2.單項(xiàng)選擇題Flame screens are used to（）.

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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Fire may be spread by which means?（）.

A.Conduction of heat to adjacent surfaces
B.Direct radiation
C.Convection
D.All of the above