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【单选题】
关于G90 G16 G00 X50 Y60说法正确的是( )。
A.
以直角坐标系原点建立极原点，X轴为极轴，定位到极半径50，极角度60点处。
B.
在直角坐标系中定位到（50,60）点。
C.
以起点建立极原点，上一段路线为极轴，定位到极半径50，极角度60点处。
D.
以起点建立极原点，X轴为极轴，定位到极半径50，极角度60点处。
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【单选题】工艺流程分析的分析改进对象只包括加工和( )。
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