單項選擇題

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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單項選擇題

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

單項選擇題

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