在不均匀电场中，电晕起始电压（    ）击穿电压。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69351' and id < 4489481 and id<>'4489481' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69351' and id > 4489481 and id<>'4489481' order by id asc limit 5