变压器的绝缘老化，主要受到（  ）等因素的直接影响。  

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id < 4500684 and id<>'4500684' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id > 4500684 and id<>'4500684' order by id asc limit 5