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【单选题】
检验车床几何精度时,在主轴插入一根短检验棒,在检验棒中心放一粒铜球,然后用固定在溜扳上的平头百分表测头触在钢球上,转动主轴进行检验。百分表读数的最大差值,即为所测误差值。以上程序测量的是( )。
A.
主轴锥轴线的径向跳动
B.
主轴轴线对溜板移动的平行度
C.
主轴轴向窜动
D.
床头和尾座两顶尖等高度
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