电力系统在下列哪些情况下运行将会出现零序电流?（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id < 4491274 and id<>'4491274' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id > 4491274 and id<>'4491274' order by id asc limit 5