单项选择题

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

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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

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

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