题目内容
抽样误差最小的是
2021-10-12
A.简单随机抽样
B.系统抽样
C.分层抽样
D.整群抽样
E.多阶段抽样
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='25512' and id < 2147779 and id<>'2147779' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25512' and id > 2147779 and id<>'2147779' order by id asc limit 5