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chart一production 对比放大图——生产用
avia.
comparator
(是绘制在质地稳定的绘图胶片上的放大图。图中绘出了精密机加零件的尺寸、外形结构,供投影比较仪用光学投影仪器投影像来验证该零件的精度)
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