电力系统为中性点(    )方式时，操作过电压最高。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69522' and id < 4504121 and id<>'4504121' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69522' and id > 4504121 and id<>'4504121' order by id asc limit 5