A.kept in nonmetal containers
B.discarded as soon as possible
C.cleaned thoroughly for reuse
D.kept in the paint locker
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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.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fuel with a nonflammable surface
A.smothering the burning material
B.chemical combination with burning material
C.absorbing the burning material
D.organic destruction of the burning material
A.8the heat of a fire melting the link
B.a break-glass and pull-cable system
C.electrical controls on the bridge
D.a mechanical arm outside the vent duct
A.should be worn while fighting a fire
B.can be used in atmospheres deficient in oxygen
C.filter contaminants from air that is to be breathed
D.may be substituted for a self-contained breathing apparatus
A.cooling
B.chemical action
C.smothering
D.inerting the air
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
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
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
A.portable
B.semi-portable
C.fixed
D.disposable
最新試題
Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.
Halon extinguishers used on a class C fire should be directed at the（）.
Fire extinguishers on inspected vessels are numbered by size I through V，with I being（）.
CO2 cylinders，which protect the small space in which they are stored must（）.
Control valves of a CO2 system may be located within the protected space when（）.
How do you operate a portable CO2 fire extinguisher?（）.
Flames from small leaks of LFG may be extinguished by（）.
Fusible-link fire dampers are operated by（）.
How does foam extinguish an oil fire?（）.
Foam extinguishes a fire by（）.