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1.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.

1.文章介绍了种新寸钻头,它主要由个偏置的多锥形个圆柱形滚及两个掌组成。

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3G, 401(K), a,

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