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如何用大数据查询接触过的人？
source link: https://www.v2ex.com/t/640710
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问与答 - @miaeLKK - 刚才看新闻上直播，李兰娟院士说：“有个患者说他没有接触过武汉的人，但是我们用大数据一查，发现他接触过 3 个。”（原话大概是这样）有人知道怎么回事吗？我想最多就是查这个人乘坐公共交通路线吧，比如火
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