小接地电流系统单相接地故障时，故障线路的3I0是（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69481' and id < 4500237 and id<>'4500237' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69481' and id > 4500237 and id<>'4500237' order by id asc limit 5