frictions差距frictionn.摩擦；摩擦力；分歧frictionclutchn.摩擦离合器friction meter摩擦系数测定仪friction noise摩擦音friction parts摩擦零件friction catch摩擦止门器friction slope摩擦比降friction shaft摩擦轴friction block摩擦块,摇枕档friction-sawn.无齿圆锯friction jewel压入式钻,依靠摩擦固定于夹板的宝石