线路纵差保护稳态情况下的不平衡电流产生原因是（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69378' and id < 4491485 and id<>'4491485' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69378' and id > 4491485 and id<>'4491485' order by id asc limit 5