單項(xiàng)選擇題Foam is a very effective smothering agent and().

A.it provides cooling as a secondary effect
B.works well on extinguishing electrical fires
C.can be used to combat combustible metal fires
D.All of the above


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

A.cooling
B.chemical action
C.smothering
D.inerting the air

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

A.smothering the burning material
B.chemical combination with burning material
C.absorbing the burning material
D.organic destruction of the burning material

3.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

4.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

5.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