While fluids flow through a pipe, dynamics loses because of the surfacefriction of pipe.
流体流经管道时，由于管道表面的摩擦力而产生力头损失。
2
Low coefficient of surfacefriction, besides properties of general modified polyes enameled round copper wire.
除具有普通的改性聚酯漆包线的特性外，还具有较小的表面摩擦系数的性能。
3
The ceramic pushing plate has high reliability, long service life, and energy-saving effect because of the low surfacefriction coefficient and small rotational resistance.