The difference between inner friction angel of sandy soil and natural slope angel of sandy soil is also put forward in this paper.
本文论述砂土内摩擦角的测定方法，及砂土内摩擦角与砂土天然坡角的区别。
For tapered roller large end and sliding friction between the inner wall, the speed limit is often lower than the same size cylindrical roller bearings.
因圆锥滚子大端与内圈挡边之间滑动摩擦，其极限转速往往低于同尺寸的圆柱滚子轴承。
Teflon Piston-ring integrated with piston, not only reduce the friction and noise, but also avoid inner-leakage.
特氟龙材料的活塞环与活塞熔接成一体不仅减磨效果好，同时能减少噪音防止内泄。
While flowing through a pipe, the fluid is subjected to the loss of head due to the friction of the inner surface of the pipe against it.
流体流经管道时，由于管道表面的摩擦力而产生力头损失。
Because the inner space of a hollow track is small, a driving wheel is arranged outside the hollow track in the prior art, and a dolly is driven to move by friction force generated by spring force.
由于空腹轨道内空间小，驱动轮安装在空腹轨道外部，靠弹簧力产生的摩擦力带动小车运行。
Because the inner space of a hollow track is small, a driving wheel is arranged outside the hollow track in the prior art, and a dolly is driven to move by friction force generated by spring force.
由于空腹轨道内空间小，驱动轮安装在空腹轨道外部，靠弹簧力产生的摩擦力带动小车运行。
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