高压电气的绝缘材料中存留有小的空气限，外施工频或冲击电压后，空气腺比绝缘材料的电场强度（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69000' and id < 4465664 and id<>'4465664' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69000' and id > 4465664 and id<>'4465664' order by id asc limit 5