单选题Any extinguishing agent used on a Class C fire must have which important property?（）ACooling abilityBLeaves no residueCPenetrating powerDNonconductivity
单选题
Any extinguishing agent used on a Class C fire must have which important property?（）
A
Cooling ability
B
Leaves no residue
C
Penetrating power
D
Nonconductivity
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