短语词组短语taper boring 圆锥形孔镗削internal ratio taper boring 内锥形镗孔internal taper boring 内锥形镗孔PORTABLE TAPER BORING MACHINE 便携式锥形镗床Taper hole boring axis 镗轴锥孔nipple taper hole boring machine [机]管接头锥孔镗床 返回 boring taper