4.竖直放置的劲度系数为k的轻质弹簧上端与质量m的小球连接下端与水平桌面上的质量为m的绝缘物块相连小球带正电电量为q且与弹簧绝缘物块 Template




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tomski4.竖直放置的劲度系数为k的轻质弹簧上端与质量m的小球连接下端与水平桌面上的质量为m的绝缘物块相连小球带正电电量为q且与弹簧绝缘物块 coloring