题目内容

堆积式二维条码或层排式二维条码也称作()。

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出厂粉煤灰的标识包括:粉煤灰种类、等级、生产方式、批号、数量、生产厂名称和地址、出厂日期等()

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?

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

矩阵制式项目组织的主要特征

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