网络释义
1)left hand thread,左螺纹2)left thread,左螺纹3)left-hand drill pipe,左螺纹钻杆4)left hand screw,左螺旋5)left-handed screw nut,左螺帽6)left spiral bolt,左螺旋锚杆7)former.Left-hand spiral rule,左螺旋定则8)left-hand screw drill pipe,左螺旋钻杆9)left-spiral flute tap,左螺旋槽丝锥10)right lead spiral burr,左螺旋刻石刀
