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 fighting equipment requirements for a particular vessel may be found on the（）.
Halon extinguishers used on a class C fire should be directed at the（）.
Fire hose couplings（）.
How is the external flotation bladder of an immersion suit inflated?（）
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Foam extinguishes a fire by（）.
Foam is a very effective smothering agent and（）.
Firefighting foam is only effective when the foam（）.
How does foam extinguish an oil fire?（）.
High-velocity fog（）.