Ultimately, the most rigorous traceability solutions, including QR codes and microchips, won't be useful if people don't actually check them as a condition of making their purchases. Imitators can simply counterfeit QR code labels, for example.
「有時候，在一些小型、快速、粗略的調查中，你的確會看到一些完全離譜（bonkers）的回答，」聖經公會研究主管麥卡利爾博士。。业内人士推荐Line官方版本下载作为进阶阅读
更多详细新闻请浏览新京报网 www.bjnews.com.cn，这一点在夫子中也有详细论述
优势：时间复杂度O(n+k)，k为数据范围，更多细节参见旺商聊官方下载