单选题The usual method of effectively applying foam on a fire is by （）.Aspraying directly on the base of the fireBflowing the foam down a vertical surfaceCsweeping the fire before you with the foamDspraying directly on the surface of the fire
单选题
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
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