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單項選擇題

Class C fires are best extinguished by （）.

A.foam extinguishers
B.water spray equipment
C.dry powder extinguishers
D.soda-acid extinguishers

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單項選擇題

Class B fires are best extinguished by smothering, i-e（）.

A.deprival of oxygen
B.removal of heat
C.spraying of water
D.injecting of soda-acid

單項選擇題

Class A fires are best extinguished by quenching or cooling with （）.

A.deprival of oxygen
B.a water spray
C.soda-acid
D.foam

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