If indeed the friction coefficient is independent of surface area, then when I tilt them they should start to slide roughly at the same Angle.
若摩擦系数真的，与接触面积没有关系，那么两者下滑时的角度，应该基本相当。
This surface has extreme hardness (60 RC. ), excellent wear and corrosion resistance, and low coefficient of friction.
这表面有极高的硬度（60局。），耐磨性和耐腐蚀性，低摩擦系数。
It is the high surface energy that contributed to larger friction coefficient of polyurethane threads.
高表面能引起的粘着为聚氨酯摩擦系数较高的主要原因。
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