用力法解图所示结构的未知量个数为（       ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='7463' and id < 586008 and id<>'586008' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='7463' and id > 586008 and id<>'586008' order by id asc limit 5