中性点不接地系统发生单相接地故障时，流过故障线路始端的零序电流（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500199 and id<>'4500199' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500199 and id<>'4500199' order by id asc limit 5