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【单选题】
关于G92指令格式:G92 X(U) Z(W) R F ;下列说法正确的是()。A.
X 、Z为螺纹编程终点的相对坐标，X为半径值；
B.
F 为主轴转速。
C.
R 为圆锥螺纹起点半径与终点半径的差值， 圆柱螺纹R为0，可省略 。
D.
U 、W为螺纹编程终点相对编程起点的X、Z向绝对坐标，U为直径值;
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