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

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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

单项选择题

A.base of the equipment
B.top of the equipment
C.power source
D.source of the fire