对称Y形和对称∆形网络等效变换的公式为。（）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598782 and id<>'2598782' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598782 and id<>'2598782' order by id asc limit 5