frictional electrical machine造句

例句与造句

1. Cover historical frictional electrical machines eg by Otto _ von _ Guericke # Electrostatic _ Investigations, Francis Hauksbee in early 1700s as used by S Gray in his conduction experiments
2. Accepting the claim of the preface to the " Experimenta Nova " that the entire work had been essentially completed before March 1663, von Guericke can be fairly credited with inventing a primitive form of frictional electrical machine before 1663.
3. It's difficult to find frictional electrical machine in a sentence. 用frictional electrical machine造句挺难的