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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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单选题Firefighting foam is only effective when the foam（）.A
penetrates to the bottom of the fireB
is kept saturated with low-velocity water fogC
mixes with the burning fuel oilD
completely covers the top of the burning liquid
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