矩形截面导体竖放比平放散热效果（  ）。 

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id < 4500337 and id<>'4500337' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id > 4500337 and id<>'4500337' order by id asc limit 5