永动机只能是一种无摩擦力的机器。
理论上，一个无摩擦力的，或者说是理想的机器，输入和输出的功相等，因此效率是1，或者说是100%。
In a theoretically frictionless, or ideal, machine, the work input and work output are equal, and the efficiency would be 1, or 100%.
无滑动、摩擦、转动部件，可降低能量损失。
No sliding, friction, rotating components, can reduce the energy loss.
温差越大，无保温管与有保温管伸长量之差越大，则保温层摩擦力越大；
The more pipe have temperature difference, the more pipe elongation and insulation friction.
若实验过程中假设钢管的弹性模量和钢材的弹性模量相等且为常数，则保温层摩擦力和无保温管与有保温管伸长量之差成正比；
The experiment is assumed that the elastic modulus of the steel pipe equal and constant, the insulation layer friction proportional to the difference of elongation.
本文提出了一种基于迭代技术的边界元法求解三维无滑动摩擦型弹性接触问题。
A boundary element method based on an iterative technique for solving the three-dimensional elastic contact problem without sliding is presented.
本文抓住刚体无滑滚动的运动学特征，通过分析主动力和静摩擦力各自的贡献，提出一种形象、直观的求解方法。
This paper grasps its kinematic traits and gives a specific and intuitionistic solution through analysing each contribution of main motivity and static friction.
无粘结预应力筋摩擦力小，且易弯曲成各种形状，特别适合建造需用复杂的连续曲线配筋的大跨度楼盖和屋盖。
The tendons of unbounded PPC have smaller fraction force and are easier to bend to many shapes , so it is more suited for building these rooms whose span are large.
无粘结预应力筋摩擦力小，且易弯曲成各种形状，特别适合建造需用复杂的连续曲线配筋的大跨度楼盖和屋盖。
The tendons of unbounded PPC have smaller fraction force and are easier to bend to many shapes , so it is more suited for building these rooms whose span are large.
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