A.By cooling the oil below the ignition temperature
B.By removing the fuel source from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil
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A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip
A.is a finer，more diffuse water spray than low-velocity fog
B.requires that the water pressure be no greater than 60 psi
C.produces an effective fog pattern no more than 6 feet beyond the nozzle
D.extinguishes a fire by absorbing heat and reducing the supply of oxygen
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
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
最新試題
Fire hose couplings（）.
Fire extinguishers of sizes III，IV，and V are designated as（）.
Halon extinguishes a fire by（）.
How is the external flotation bladder of an immersion suit inflated?（）
Fire extinguishers on inspected vessels are numbered by size I through V，with I being（）.
Halon extinguishers used on a class C fire should be directed at the（）.
CO2 cylinders，which protect the small space in which they are stored must（）.
How does foam extinguish an oil fire?（）.
Control valves of a CO2 system may be located within the protected space when（）.
CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.