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

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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

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

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Flame screens are used to（）.

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Fixed CO2 systems would not be used on crew’s quarters or（）.

Firefighting foam is only effective when the foam（）.

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Fixed CO₂ systems would not be used on crew’s quarters or（）.