2018-2019学年度人教版选修二Unit 3 Computers-Reading课件(共19张PPT)
2018-2019学年度人教版选修二Unit 3 Computers-Reading课件(共19张PPT)第5页

1642

1822

1936

1940

1970

calculating machine

analytical machine

universal machine

computers as large as a room

personal computers and laptop

Changes