.空气中带电部分与接地部分之间的最小安全净距为A1. (     )

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496880 and id<>'4496880' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496880 and id<>'4496880' order by id asc limit 5