已知向量、满足，且，则=   [     ]（     ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20428' and id < 1878556 and id<>'1878556' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20428' and id > 1878556 and id<>'1878556' order by id asc limit 5