轻绳绕圆柱有�擦,求绳两端拉力为多�时刚好要�动大学物理,为什么不能看成整体,只能积分? 知乎 Template




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tomski轻绳绕圆柱有�擦,求绳两端拉力为多�时刚好要�动大学物理,为什么不能看成整体,只能积分? 知乎 coloring