单选题As an extinguishing agent,foam（）.Acouducts electricityBshould be directed at the base of the fireCis most effective on burning gases which are flowingDextinguishes by cooling oil fires blow ignition temperature
单选题
As an extinguishing agent,foam（）.
A
couducts electricity
B
should be directed at the base of the fire
C
is most effective on burning gases which are flowing
D
extinguishes by cooling oil fires blow ignition temperature
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