单选题Halon from extinguishers used on a class B fire，should be directed（）.Aat the top of the flamesBat the base of the fire near the edgeCin short quick burstsDtoward the upwind side of the fire
单选题
Halon from extinguishers used on a class B fire，should be directed（）.
A
at the top of the flames
B
at the base of the fire near the edge
C
in short quick bursts
D
toward the upwind side of the fire
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