零序电流通过变压器的（  ）和接地故障点形成短路回路。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69479' and id < 4501043 and id<>'4501043' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69479' and id > 4501043 and id<>'4501043' order by id asc limit 5