中性点不接地系统，发生单相故障，非故障相电压上升为(    )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69497' and id < 4501971 and id<>'4501971' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69497' and id > 4501971 and id<>'4501971' order by id asc limit 5