激光从一种介质传播到折射率不同的另一种介质时,在介质之间的界面上将出现()
参考答案:反射与折射
用所给词的适当形式填空。
1. She is __ (real) good, isn't she?
2. It __(look) like rain, doesn't it?
3. Do you think the rain __ (stop) by noon?
4. The coat __(cost) me 100 dollars last year.
5. Have you ever __ (be)to this school?
6. Thank you for __ (invite) me.
7. They are all __ (friend) to our math teacher.
8. Mary said he __ (help) me with my geography.
9. They have been __ (study) foreign languages here.
10. You must be __ (care) to cross the street.
人本主义的主要代表人物是()。
A.冯特和铁钦纳
B.杜威和安吉尔
C.罗杰斯和马斯洛
D.魏特海默、克勒和科夫卡