单选题Which statement about firefighting foam is TRUE?（）AFoam conducts electricityBTo be most effective，foam should be directed at the base of the fireCFoam is most effective on burning liquids which are flowingDFoam can ONLY be used to extinguish class A fires
单选题
Which statement about firefighting foam is TRUE?（）
A
Foam conducts electricity
B
To be most effective，foam should be directed at the base of the fire
C
Foam is most effective on burning liquids which are flowing
D
Foam can ONLY be used to extinguish class A fires
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