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运用灰色统计理论对零件质量要求的各项指标归纳运算，判断统计指标所属的灰类，从而更合理地评价产品各项质量的优劣．
By using the gray statistics theory, the indexes of the parts’ quality are summed up, and the gray scales belonging to the statistical indexes are judged, so as to evaluate the quality of the products more reasonably.