()可视为由底相对的大小不同的三棱镜单向排列组成。
A、正球面透镜
B、负球面透镜
C、负柱面透镜
D、正柱面透镜
参考答案:D
用所给词的适当形式填空。
1. December is the __________ (twelve) month of a year.
2. He takes a shower __________ (one) a week.
3. Let's __________ (play) games tonight.
4. The __________ (two) Sunday in May is Mother's Day.
5. Can you come to the movies with __________ (we)?
下列不属于非柜台委托的是( )。
A.书面委托
B.电话委托
C.传真委托
D.自助委托