单选题An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.Alack of toxicityBthe multipurpose extinguishing abilityCburn-back protectionDcooling ability
单选题
An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.
A
lack of toxicity
B
the multipurpose extinguishing ability
C
burn-back protection
D
cooling ability
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