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。
Conclusion: the attention would be played to the influence of the roughness and abrasion of the bracket slot area on friction and anchorage control in using sliding mechanics.
结论：使用直丝弓矫治技术时，应重视托槽表面粗糙、磨损对摩擦力的影响，注意支抗控制。
The calculation of pile negative friction is a important foundation for pile foundation design when pile foundation is in large area filled up ground.
在大面积的填土地基上做桩基础，桩的负摩擦力的计算是桩基设计中的重要依据。
The variation of local friction coefficient is similar to velocity and local minimum value occurred in reverse flow area.
摩擦阻力的变化趋势与速度类似，在产生逆向流处出现局部极小值。
The variation of local friction coefficient is similar to velocity and local minimum value occurred in reverse flow area.
摩擦阻力的变化趋势与速度类似，在产生逆向流处出现局部极小值。
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