单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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