A.at the top of the flames
B.at the base of the fire near the edge
C.in short quick bursts
D.toward the upwind side of the fire
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A.Fires in electrical equipment
B.Flammable oils and greases
C.Class A fires in ordinary combustibles
D.Materials containing their own oxygen
A.cooling
B.smothering
C.shielding of radiant heat
D.breaking the chain reaction
A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fuel with a nonflammable surface
A.base of the equipment
B.top of the equipment
C.power source
D.source of the fire
A.allowing better access in an emergency
B.eliminating potential fuel sources
C.eliminating trip hazards
D.improving personnel qualifications
A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call the local fire department
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.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.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
最新试题
CO2 cylinders，which protect the small space in which they are stored must（）.
Fire extinguishers of sizes III，IV，and V are designated as（）.
Halon extinguishes a fire by（）.
Flames from small leaks of LFG may be extinguished by（）.
Foam extinguishes a fire mainly by（）.
Control valves of a CO2 system may be located within the protected space when（）.
Fire extinguishing agents used on Class C fires must be（）.
Gas masks（）.
Halon from extinguishers used on a class B fire，should be directed（）.
High-velocity fog（）.