Foam is a very effective smothering agent and（）.<br>A:it provides cooling as a secondary effect<br>B:works well on extinguishing electrical fires<br>C:can be used to combat combustible metal fires<br>D:All of the above

Foam is a very effective smothering agent and（）.
A:it provides cooling as a secondary effect
B:works well on extinguishing electrical fires
C:can be used to combat combustible metal fires
D:All of the above

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