线路发生金属性三相短路时，保护安装处母线上的残余电压（  ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500140 and id<>'4500140' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500140 and id<>'4500140' order by id asc limit 5