The usual method of effectively applying foam on a fire is by （）.<br>A:spraying directly on the base of the fire<br>B:flowing the foam down a vertical surface<br>C:sweeping the fire before you with the foam<br>D:spraying directly on the surface of the fire

The usual method of effectively applying foam on a fire is by （）.
A:spraying directly on the base of the fire
B:flowing the foam down a vertical surface
C:sweeping the fire before you with the foam
D:spraying directly on the surface of the fire

出自：海船船员证

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