1) In 1831, two physicists, _ _ _ _ _ _ _ _ _ _ _ _ _ _ in England and _ _ _ _ _ _ _ _ _ _ _ in the United States, independently discovered that magnetism could produce an electric current in a wire. a) g b) f c) d d) t e) x f) y

MOL

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？