?三缘钻头

... three-lipped twist drill 三缘麻花钻 lipped joint 唇接,半搭接... three-lipped drill 三缘钻头 ...

?三刃钻头

... 三颚夹头 three-jaw chuck 三刃钻头 three-lipped drill 三路式热风炉 three-pass stove ...