条形码原理

  Seves

    1. 条形码的原理: EAN-13编码,校验码算法和作用,前置数字推算的排列组合
      https://blog.csdn.net/kangkanglhb88008/article/details/86468830

    2. 条形码区别商品是国产还是进口

    3. https://www.zhihu.com/question/20256672

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