题目内容

单一形状循环的动作顺序是?

A. 切入-切削-退刀-返回
B. 切入-切削-返回-退刀
C. 切入-退刀-切削-返回
D. 切入-返回-切削-退刀

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A. 对
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A. 对
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D. hadn’t written

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A. will have finished
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