直观手段的类型有()
A.言语直观、模像直观和抽象直观
B.符号直观、模像直观和实物直观
C.抽象直观、言语直观和符号直观
D.言语直观、实物直观和模像直观
参考答案:D
Krashen’s ______ order hypothesis states that we acquire the rules of language in a predictable order, some rules tending to come early and other late.
下述修复体属于瓷全冠的有
A.压铸瓷全冠
B.渗透陶瓷全冠
C.CAD/CAM瓷全冠
D.瓷沉积全冠
E.PFM全冠