在实验法中，多变量的实验设计有（）
A.后测实验
B.前测后测设计
C.打丁方设计
D.四组设计
E.完全随机多因实验设计
参考答案：C, E
It's helpful to put children in a situation _____ they can see themselves differently. [ ]
A. that
B. when
C. which
D. where
甲状腺功能减退的面容是
A．贫血面容B．苦笑面容C．二尖瓣面容D．伤寒面容E．黏液水肿面容
