程序段N10 R1=30 R2=32 R3=50 R4=20；N20 G00 X=R2*SIN（R1）+R4 Z=R2*COS（R1）+R3；中，只对X坐标值有影响的R参数是（）（SIEMENS系统）。A、R1B、R2C、R3D、R4
程序段N10 R1=30 R2=32 R3=50 R4=20；N20 G00 X=R2*SIN（R1）+R4 Z=R2*COS（R1）+R3；中，只对X坐标值有影响的R参数是（）（SIEMENS系统）。
- A、R1
- B、R2
- C、R3
- D、R4
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