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單項(xiàng)選擇題

Halon extinguishes fire primarily by（）.

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

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單項(xiàng)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

單項(xiàng)選擇題

Halon extinguishers used on a class C fire should be directed at the（）.

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

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