单选题An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.Acarbon dioxideBHalon 1301Cdry chemicalDwater fog
单选题
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
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