As an extinguishing agent，foam（）.<br>A:conducts electricity<br>B:should be directed at the base of the fire<br>C:is most effective on burning gases which are flowing<br>D:extinguishes by cooling oil fires below ignition temperature

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

出自：海船船员证

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