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/R52:毛坯X；R50:最后X；R55:终点Z；R51:每刀切深
M03 S900 T0101
N0000 r50=60000
r55=-120000
N0010 r51=7000
r52=90000
N0020 G00 Xr52 Z2
N0040 r52=r52-r51
if (r52 < r50) then r52=r50
N0050 G90 Xr52 Zr55 F200
N0060 if (r52 > r50) then P0040 else P0070
N0070 M30