A:3
B:4
C:18
D:40
如图是花的基本结构示意图,请根据图回答:
《中华人民共和国教师法》颁布的时间是( )。
⑴ ____ A. Beijing is a great city.
⑵ ____ B. Time to go back to school.
⑶ ____ C. Don't forget to take some pictures.
⑷ ____ D. I'm putting on my new coat.
⑸ ____ E. What a fun trip!
将一副直角三角尺如图放置,若∠AOD=20°,则∠BOC的大小为( )