BarCode Allthepacketsyoubuyinasupermarketcarryabarcod...
问题详情：BarCode Allthepacketsyoubuyinasupermarketcarryabarcode．Thiscodeisscanned（扫描）bylaserlightandthebrandandproductnamesaregiventothecustomerwiththeprice．Thepeoplerunningthestorecankeepacontinuou...