- 问题详情:BarCode Allthepacketsyoubuyinasupermarketcarryabarcode.Thiscodeisscanned(扫描)bylaserlightandthebrandandproductnamesaregiventothecustomerwiththeprice.Thepeoplerunningthestorecankeepacontinuouscheckofhowmanypacketsofeachproductandofsizeareont...
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