For a rather long time,electricity and magnet had been regarded as two independentphysical realities. It was Ampere who first connected both of them,and rationally pointed outthe essential of magnet to still coincide with electricity,or no more than some (共 947 字) [阅读本文] >>


说明: 本文档由创作者上传发布,版权归属创作者。若内容存在侵权,请点击