BarCode Allthepacketsyoubuyinasupermarketcarryabarcod...
問題詳情：BarCode Allthepacketsyoubuyinasupermarketcarryabarcode．Thiscodeisscanned（掃描）bylaserlightandthebrandandproductnamesaregiventothecustomerwiththeprice．Thepeoplerunningthestorecankeepacontinuou...