关于DL/T620-1 997标准中山区架空送电线路防雷计算参数修正的探讨
관우DL/T620-1 997표준중산구가공송전선로방뢰계산삼수수정적탐토
Probe into Lightning- Protection Calculation Parameter Correction of Mountainous Overhead Feeder Line in DL/T620- 1997 Standard
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