frictional machine造句

例句与造句

1. Volta's inventions led to revolutionary changes with this method of the production of inexpensive, controlled electric current vs . existing frictional machines and Leyden jars.
2. For the sulphur ball of von Guericke ( 1671 ) and the glass globe of Isaac Newton ( some say Hauksbee ), Gordon substituted a glass cylinder which made an efficient frictional machine.
3. It's difficult to find frictional machine in a sentence. 用frictional machine造句挺难的