通过对级配进行比较分析，提出结构层关键筛孔施工控制指标。
Compare gradation of deferent position, then take construction guideposts of structure level.
分析了三层滚筒式银杏分级机的结构特点及工作过程，并对分级机的分级性能及筛孔大小进行了试验研究。
This paper analyzed the structure and the working process of three-layer-cylindrical grader and the grading performance and screen mesh-size are experimentally studied.
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