题目内容

条码识读器是通过条码符号中()对光反射率的对比来实现识读的。

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What does the word "conundrum" (Line 4, Para. 1) most probably mean？

A. Contradictory; with many disagreements.
B. A difficult problem.
C. Indistinct or not clear in definition.
D. Not yet having been ascertained or determined.

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条码识读器是通过条码符号中()对光反射率的对比来实现识读的。

What does the word "conundrum" (Line 4, Para. 1) most probably mean？

矩阵制式项目组织的主要特征

在这个全新时代，农人一词被赋予了全新的概念和意义，农人和农民有着一定的质的区别;现代农村发展需要“新农人”。()

简述商品条码的应用。