单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.combustible material
B.ignition source
C.oxygen
D.A and B and C