题目内容
调査某市中学生吸烟情况,最佳的抽样方 法是
2022-01-04
A.简单随机抽样
B.系统抽样
C.分层抽样
D.整群抽样
E.分层整群抽样
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='30565' and id < 2466680 and id<>'2466680' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30565' and id > 2466680 and id<>'2466680' order by id asc limit 5