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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1072520/sn74hc02-sn74hc02-material-oxidation-confirmation
进来的材料有两种颜色，请检查黄叶材料是否被氧化，白色区域的情况如何。
您好，贝拉，
请参阅以下常见问题： [FAQ]为什么导联框架看起来严重氧化或腐蚀？
