Firefighting foam is only effective when the foam（）.<br>A:penetrates to the bottom of the fire<br>B:is kept saturated with low-velocity water fog<br>C:mixes with the burning fuel oil<br>D:completely covers the top of the burning liquid

Firefighting foam is only effective when the foam（）.
A:penetrates to the bottom of the fire
B:is kept saturated with low-velocity water fog
C:mixes with the burning fuel oil
D:completely covers the top of the burning liquid

出自：海船船员证

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