frictionizev.擦frictionn.摩擦；摩擦力；分歧friction with the air与空气的摩擦frictional properties摩擦性能frictional constraint摩擦约束friction countershaft摩擦离合器副轴friction feed printer摩擦进纸打印机frictionless cylinder无摩擦气缸frictional dermatitis磨擦性皮炎friction stir welding搅拌摩擦焊friction ratchet stop摩擦棘轮停止器friction nonlinearity摩擦非线性特性