Unit18Inventions课件
日期:2010-01-17 01:29
TV, paper cups…
Inventions in the 20th century:
In the 1920s :robot, coffee,auto-watch,the compass
paper
Printing
Gunpowder
The first twenty years in the 20th century:
plane,the first film with sound (美国华纳兄弟电影公司拍摄的《爵士乐歌手》),electric shaver,frozen f,
查看全部