问题
单项选择题
Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.
A.cooling
B.smothering
C.oxygen dilution
D.breaking the chain reaction
答案
参考答案：D
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Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.
A.cooling
B.smothering
C.oxygen dilution
D.breaking the chain reaction
参考答案：D