一个物体受到多个力时,什么条件下,这些力就可以都画在受力物体的重心上,什么条件下就不能移动? 知乎 Template




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tomski一个物体受到多个力时,什么条件下,这些力就可以都画在受力物体的重心上,什么条件下就不能移动? 知乎 coloring