单项选择题
A.#30 B.#140 C.#2000 D.#5201
A.G17 G90 G02X-30.0Y0 R50.0 F50 B.G17 G90 G03X-300.0Y0 R-50.0 F50 C.G17 G90 G03X-30.0Y0 R-50.0 F50 D.G17 G91 G02X30.0Y0 R50.0 F50
A.G08 B.G09 C.G10 D.G39