A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids
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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
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
最新試題
Firefighting foam is only effective when the foam（）.
CO2 cylinders，which protect the small space in which they are stored must（）.
Halon extinguishes a fire by（）.
Fusible-link fire dampers are operated by（）.
Foam extinguishes a fire by（）.
How is the external flotation bladder of an immersion suit inflated?（）
Fire alarm system thermostats are actuated by（）.
Halon extinguishers used on a class C fire should be directed at the（）.
Foam extinguishes a fire by（）.
Foam-type portable fire extinguishers are most useful in combating fires involving（）.