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