【单选题】【消耗次数：1】
为了切除多余的材料，刀具和工件之间必须具有相对运动，即（ ）
①
切削加工
②
切削运动
③
进给运动
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相关题目
【单选题】
数控机床有不同的运动形式，需要考虑工件与刀具相对运动关系和坐标系方向，编写程序时，为方便编程，常采用（）的原则。
①
工件固定不动，刀具移动。
②
铣削加工刀具固定不动，工件移动；车削加工刀具移动，工件固定；
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分析机床运动关系后再根据实际情况两者的固定和移动关系；
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刀具固定不动，工件移动
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It is an ideal way to show materials and do presentations together
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It allows students to work together rather than under teacher’s guidance.
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There is always a great chance of different opinions and contributions to the work
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It is less stressful.
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