4.2.1 appearance rework: products that can meet customer requirements through process operation control.<br>4.2.2 performance rework: through aging process, recharge and select products that can meet customer requirements.<br>4.3 selection: the original production batch is less than the non-conforming standard (the batch is judged as qualified batch of products in normal circulation), and the selected non-conforming products are disposed as scrap.<br>4.4 special purchase: the products have slight defects, which do not affect the normal performance of the products. After MRB review, the products can meet the customer's requirements and are specially purchased.<br>
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