单选题On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）ACarbon dioxideBWater (stored pressure)CDry chemicalDFoam
单选题
On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）
A
Carbon dioxide
B
Water (stored pressure)
C
Dry chemical
D
Foam
参考解析
解析：
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