单选题When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.Aaimed at the source of the flamesBfogged above the equipmentCshot off a flat surface onto the flamesDused to shield against electrical shock
单选题
When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.
A
aimed at the source of the flames
B
fogged above the equipment
C
shot off a flat surface onto the flames
D
used to shield against electrical shock
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