A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip
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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
A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fuel with a nonflammable surface
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Fire hose couplings（）.
Fire hose should be washed with（）.
Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.
Halon extinguishes fire primarily by（）.
Fire and abandon ship stations and duties may be found on the（）.
CO2 cylinders，which protect the small space in which they are stored must（）.
Halon fire extinguishers are NOT effective when used on which types of fires?（）
Firefighting foam is only effective when the foam（）.
Gas masks（）.
How do you operate a portable CO2 fire extinguisher?（）.