The BEST method of applying foam to a fire is to（）.<br>A:spray directly on the base of the fire<br>B:flow the foam down a nearby vertical surface<br>C:sweep the fire with the foam<br>D:spray directly on the surface of the fire

The BEST method of applying foam to a fire is to（）.
A:spray directly on the base of the fire
B:flow the foam down a nearby vertical surface
C:sweep the fire with the foam
D:spray directly on the surface of the fire

出自：海船船员证

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