frictions差距
frictionn.摩擦;摩擦力;分歧
frictional pair摩擦副
friction nature摩擦性质
friction facing摩擦衬片
friction roller摩擦滚轮,摩擦滚轴
friction regime摩擦状态
friction-gearn.摩擦轮;摩擦传动装置
friction injury摩擦伤,捻错伤
friction-heat摩擦热
frictional wear摩擦磨损
friction ration滚筒速比