题目内容
流行病学实验决定样本含量的因素是
2022-03-01
A.分组情况
B.患病率高低
C.能否双盲
D.干预实验因素
E.人群选择
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='32449' and id < 2576996 and id<>'2576996' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32449' and id > 2576996 and id<>'2576996' order by id asc limit 5