轻不合格品：有一个或一个以上一般缺陷或轻微缺陷，但不包含致命和严重缺陷的单位产品。
Slightly Unacceptable product: it refers to the unit product that has one more general or slight defects, but without fatal or severe defects.
单位缺陷数反映某产品中缺陷的总数。
Defects per unit (DPU) represents the number of defects divided by the number of products.
单位缺陷数反映某产品中缺陷的总数。
Defects per unit (DPU) represents the number of defects divided by the number of products.
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