Based on various heights and the area of protected objects, we can get the height and number of lightning rod by the table, and comparing with the two methods, then the graph of lightning rod protection can be directly drawn.
根据被保护物的高度和其占地面积的大小,查表可选择出避雷针的高度和个数,并可进行两方案比较,然后直接做出防雷保护范围图。