Research methods:The analysis is made for the present situation of catenary of overhead contact wire system and main measures against wear of it.

研究方法：通过对接触网承力索的现状和主要防磨损措施的研究来进行分析。

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Research methods:The analysis is made for the present situation of catenary of overhead contact wire system and main measures against wear of it.

研究方法：通过对接触网承力索的现状和主要防磨损措施的研究来进行分析。

youdao