文中对几种导线的技术性能作了比较，最后还指出了钢铝接触线的运用前景。
The author compares the technological performances of different wires and points out the application prospect of the steel-core aluminum contact wires.
文中对几种导线的技术性能作了比较，最后还指出了钢铝接触线的运用前景。
The author compares the technological performances of different wires and points out the application prospect of the steel-core aluminum contact wires.
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