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
Foam extinguishes a fire mainly by（）.
Halon fire extinguishers are NOT effective when used on which types of fires?（）
Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.
Foam extinguishes a fire by（）.
Gas masks（）.
Fire may be spread by which means?（）.
Fire fighting equipment requirements for a particular vessel may be found on the（）.
Firefighting foam is only effective when the foam（）.
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Fire extinguishers on inspected vessels are numbered by size I through V，with I being（）.