单项选择题

An important step in fighting any electrical fire is to（）.

A.stop ventilation
B.stop the vessel
C.de-energize the circuit
D.apply water to extinguish the fire

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单项选择题
An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.

A.carbon dioxide
B.Halon 1301
C.dry chemical
D.water fog
单项选择题
An engine compartment gasoline fire requires which type of extinguisher?（）.

A.Carbon dioxide
B.Dry chemical
C.Foam
D.All of the above
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