In this paper,a new small-sized bit is introduced.The bit is mainly composed of a biassed polyconic cutter,a cylindric roller and two bit legs.
文
了
种新型小尺寸钻头，它主要由个偏置的多锥形牙轮和个圆柱形滚轮及两个牙掌组成。
In this paper,a new small-sized bit is introduced.The bit is mainly composed of a biassed polyconic cutter,a cylindric roller and two bit legs.
文了种新型小尺寸钻头，它主要由个偏置的多锥形牙轮和个圆柱形滚轮及两个牙掌组成。
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