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【多选题】
关于架空导线的材料钢导线，下列说法正确的是（ ）。
A.
钢不能用作导线材料。
B.
电阻率高、但机械强度高
C.
价格低廉，
D.
在一些特殊地段(如大跨越档距)可以采用，主要应用于避的架设。
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