题目内容
系统抽样又称为 ( )
2022-01-08
A.简单随机抽样
B.等距抽样
C.分层随机抽样
D.整群抽样
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='30773' and id < 2477731 and id<>'2477731' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30773' and id > 2477731 and id<>'2477731' order by id asc limit 5