“speed change box of machine tool”的概念、定义、翻译、参考文献-科学参考

单词	speed change box of machine tool
释义	speed change box of machine tool Encyclopedia 工学机床释 speed change box of machine tool机床变速箱改变机床主运动速度（如主轴转速、工作台每分钟往复行程数等）的机构。
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