短语词组短语drill l collar 钻铤Slick Drill Collar 普通钻铤drill collar number [油气]钻铤数字Drill Collar Fingerboard 钻铤指粱Drill Collar Slip 钻铤卡瓦weight drill collar 偏重钻铤drill collar sroove 钻铤应力减轻槽drill collar stand 钻铤立柱 返回 drill collar