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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A.cooling
B.chemical action
C.smothering
D.inerting the air
A.smothering the burning material
B.chemical combination with burning material
C.absorbing the burning material
D.organic destruction of the burning material
A.shutting off the air supply
B.cooling the fuel to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition
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
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
最新試題
Halon fire extinguishers are NOT effective when used on which types of fires?（）
Foam extinguishes a fire mainly by（）.
Foam extinguishes a fire by（）.
How do you operate a portable CO2 fire extinguisher?（）.
Flames from small leaks of LFG may be extinguished by（）.
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Fire hose couplings（）.
Halon from extinguishers used on a class B fire，should be directed（）.
Good housekeeping on a vessel prevents fires by（）.
Foam extinguishes a fire by（）.