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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How does foam extinguish an oil fire?（）.
Fire hose should be washed with（）.
Halon extinguishes a fire by（）.
Fire may be spread by which means?（）.
Fire extinguishing agents used on Class C fires must be（）.
Halon from extinguishers used on a class B fire，should be directed（）.
Fire fighting equipment requirements for a particular vessel may be found on the（）.
Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.
Foam extinguishes a fire by（）.
Flame screens are used to（）.