导体截面积的选择方法有（  ）。 

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69484' and id < 4500593 and id<>'4500593' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69484' and id > 4500593 and id<>'4500593' order by id asc limit 5