Because of vast volume of a dam, the coarse aggregate of concrete used for constructing a dam is of large grain size and more grading.

由于水坝的体积大，用来筑坝的混凝土的粗骨科粒径大、分级多。合理确定最大粒径、分级尺寸和级配十分重要。

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The intelligent grading system of grain purchasing can improve the accuracy of moisture content. It also can clear and definite the quality grade of the grain.

粮食收购智能定等系统可以提高水分检测的精确度，明确粮食的质量等级。

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A series of new techniques are adopted to set up the automatic grading system for the isolation and reconstruction of grain boundaries in quantitative metallograph analysis.

本文介绍利用一系列新颖的图像处理技术，实现了定量金相分析中的晶界重建和晶粒度自动评级。

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