单项选择题
A.20 B.25 C. D.28
A.N60G01X60.0Y20.0;N70Z-3.0 B.N60G01Z-3.0;N70M03S800 C.N60M03S800;N70G01Z-3.0 D.N60M03S800;N70M08
A.0 B.25 C.–25 D.50
A.G40 B.G41 C.G42 D.G43
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