Since 1980s, people have studied how to improve the information （） of barcode symbol.
A.amount
B.density
C.number
D.crowdedness
正确答案：density
Since 1980s, people have studied how to improve the information （） of barcode symbol.
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In the process of postal operation and modern logistics, the small sized barcode plays an important role in automatic processing
But for many reasons, the technology was not （） until more than 20 years later.
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