如图(这是俯视图),A是轮子(或者是轴)用一根线牵着B在有摩擦的水平桌子上转(已经达到稳定状态了)虚线是B轨迹问:桌子对B的摩擦方向是1还是2书上说是2
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![如图(这是俯视图),A是轮子(或者是轴)用一根线牵着B在有摩擦的水平桌子上转(已经达到稳定状态了)虚线是B轨迹问:桌子对B的摩擦方向是1还是2书上说是2](/uploads/image/z/4984608-48-8.jpg?t=%E5%A6%82%E5%9B%BE%EF%BC%88%E8%BF%99%E6%98%AF%E4%BF%AF%E8%A7%86%E5%9B%BE%EF%BC%89%2CA%E6%98%AF%E8%BD%AE%E5%AD%90%EF%BC%88%E6%88%96%E8%80%85%E6%98%AF%E8%BD%B4%EF%BC%89%E7%94%A8%E4%B8%80%E6%A0%B9%E7%BA%BF%E7%89%B5%E7%9D%80B%E5%9C%A8%E6%9C%89%E6%91%A9%E6%93%A6%E7%9A%84%E6%B0%B4%E5%B9%B3%E6%A1%8C%E5%AD%90%E4%B8%8A%E8%BD%AC%EF%BC%88%E5%B7%B2%E7%BB%8F%E8%BE%BE%E5%88%B0%E7%A8%B3%E5%AE%9A%E7%8A%B6%E6%80%81%E4%BA%86%EF%BC%89%E8%99%9A%E7%BA%BF%E6%98%AFB%E8%BD%A8%E8%BF%B9%E9%97%AE%EF%BC%9A%E6%A1%8C%E5%AD%90%E5%AF%B9B%E7%9A%84%E6%91%A9%E6%93%A6%E6%96%B9%E5%90%91%E6%98%AF1%E8%BF%98%E6%98%AF2%E4%B9%A6%E4%B8%8A%E8%AF%B4%E6%98%AF2)
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