單項選擇題How do you operate a portable CO2 fire extinguisher?（）.

A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip


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1.單項選擇題High-velocity fog（）.

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

2.單項選擇題Halon from extinguishers used on a class B fire，should be directed（）.

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

3.單項選擇題Halon fire extinguishers are NOT effective when used on which types of fires?（）

A.Fires in electrical equipment
B.Flammable oils and greases
C.Class A fires in ordinary combustibles
D.Materials containing their own oxygen

4.單項選擇題Halon extinguishes fire primarily by（）.

A.cooling
B.smothering
C.shielding of radiant heat
D.breaking the chain reaction

5.單項選擇題Halon extinguishes a fire by（）.

A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fuel with a nonflammable surface