题目内容
采用随机对照和双盲实验研究方法的文献，属于
2021-10-20
A.五级证据
B.四级证据
C.三级证据
D.二级证据
E.一级证据
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='26133' and id < 2189711 and id<>'2189711' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26133' and id > 2189711 and id<>'2189711' order by id asc limit 5