单项选择题

A.G82 X50.0 Y50.0 Z-10.0 R0 P2 F50
B.G81 X50.0 Y50.0 Z-10.0 R0 F50
C.G81 X50.0 Y50.0 Z-10.0 R5.0 F50
D.G83 X50.0 Y50.0 Z-10.0 R0 Q5.0 F50