单选题Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.Ainsulate your shoesBground the fire hoseCsecure its power supplyDstart the fire pump
单选题
Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.
A
insulate your shoes
B
ground the fire hose
C
secure its power supply
D
start the fire pump
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