单选题The BEST method of applying foam to a fire is to（）.Aspray directly on the base of the fireBflow the foam down a nearby vertical surfaceCsweep the fire with the foamDspray directly on the surface of the fire
单选题
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
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