单选题As an extinguishing agent，foam（）.Aconducts electricityBshould be directed at the base of the fireCis most effective on burning gases which are flowingDextinguishes by cooling oil fires below ignition temperature
单选题
As an extinguishing agent，foam（）.
A
conducts 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 below ignition temperature
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