在接地体径向地面上，水平距离为(    )m的两点间的电压称为跨步电压。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69523' and id < 4504171 and id<>'4504171' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69523' and id > 4504171 and id<>'4504171' order by id asc limit 5