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
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
单项选择题
Halon extinguishes fire primarily by（）.

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