弹力的方�是从施力物体指�受力物体与施力物体的形变方�相反.具体地说1绳的拉力方�总是沿绳而指�绳收缩的方�.2压力的方�垂直于 Template




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tomski弹力的方�是从施力物体指�受力物体与施力物体的形变方�相反.具体地说1绳的拉力方�总是沿绳而指�绳收缩的方�.2压力的方�垂直于 coloring