中性点不接地电网的单相接地故障出现较多时，为反应单相接地故障，常采用（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69517' and id < 4503663 and id<>'4503663' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69517' and id > 4503663 and id<>'4503663' order by id asc limit 5