“step drilling tool”的概念、定义、翻译、参考文献-科学参考

单词	step drilling tool
释义	step drilling tool Encyclopedia 工学磨削基础理论释 step drilling tool台阶钻能够将钻孔、扩孔复合为一次进刀加工完成的钻头。又称阶梯钻、宝塔钻。
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