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.
文章介绍了一种新型小尺寸钻头，它主要由一个偏置的多锥
和一个圆柱
及两个掌
。
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.
文章介绍了一种新型小尺寸钻头，它主要由一个偏置的多锥和一个圆柱及两个掌。
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