题目内容

执行G76循环指令时,刀具以切削进给方式加工到孔底,主轴准停后刀具快速退至R平面。

A. 对
B. 错

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选出分数2/7的正确读法

A. two seven
B. two sevenths
C. second seven
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A. five twelfth
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