每个数字都有特殊意义，一般只有内部人员明白编号的实际意义，条形码则复杂得多，因为采用不同的技术条形码的加密方式不一样的，单总的来说每个企业的条形码都是唯一的。
有印章的，每个机构都会有秘密条码。只要输入隐形码就查得到。
一号一证，一人一身份证号都是对应的
上面有个序列号，都有入教育系统的
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