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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