单选题Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）ALeaves a residueBCost，relative to other agentsCBreaks down while under prolonged storageDConducts electricity
单选题
Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）
A
Leaves a residue
B
Cost，relative to other agents
C
Breaks down while under prolonged storage
D
Conducts electricity
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