电缆隧道一边有电缆支架时，通道宽度最小允许距离是1.2m。
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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
35kV架空线路跨越公路且在最大弛度时，导线对路面的最小垂直距离为（）m。
A. 5.5
B. 6.0
C. 6.5
D. 7.0
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