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
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A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids
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.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
最新試題
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.
Fusible-link fire dampers are operated by（）.
Flames from small leaks of LFG may be extinguished by（）.
Halon extinguishes a fire by（）.
Flame screens are used to（）.
Foam extinguishes a fire by（）.
Fire alarm system thermostats are actuated by（）.
Halon fire extinguishers are NOT effective when used on which types of fires?（）
Foam extinguishes a fire mainly by（）.