An index system of lightning disaster assessment in Beijing is established based the disaster network analysis.
在灾情网络分析的基础上，建立了北京市雷电灾害的灾情评估指标体系。
According to the analysis, the back flashover and the step voltage formed when the lightning strikes a tree are the main causes of the disaster.
分析认为，雷电击中大树产生的雷电反击和跨步电压是造成这起雷灾的主要原因。
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