It appeared, at first sight, to be a lightning conductor, mounted on insulator through the roof.
一眼看去, 它似乎是一根避雷针, 安装在穿过屋顶的绝缘体上。
Calculation methods of lightning conductor protective range
避雷针保护范围的计算方法
Harm of Conventional Lightning Conductor Protection against Lightning for Information Instruments
传统避雷针保护对信息防雷的危害
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