单项选择题
A.G81 B.G84 C.G71 D.G83
A.半径值 B.顺时针旋转45º C.逆时针旋转45º D.循环参数
A.C B.F C.S D.X
A.G85X50.0Y50.0Z-10.0R0F50 B.G81X50.0Y50.0Z-10.0R0F50 C.G81X50.0Y50.0Z-10.0R5.0F50 D.G83X50.0Y50.0Z-10.0R5.0F50
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