下列故障形式中，对称的短路故障为(  )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69513' and id < 4503360 and id<>'4503360' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69513' and id > 4503360 and id<>'4503360' order by id asc limit 5