大电流接地系统，接地故障线路上零序功率方向是（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500191 and id<>'4500191' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500191 and id<>'4500191' order by id asc limit 5