For improving filling quality in deep mining, the gradation composition of classifying tailings was researched on fractal theory.
为实现深部开采高质量充填，用分形理论研究了分级尾砂级配。
Based on the influencing factors on asphalt mixture quality and service life of pavement, the control methods of broken stone diameter, gradation, composition, content of grain less than 0.
针对影响沥青混合料生产质量及沥青路面使用寿命的各种因素，提出对碎石粒径与级配、颗粒组成一致性、粗集料中0。
Method: Systematic solvent method is used to extract and silica gel dry column sheet gradation was used to separate the chemical composition.
方法：采用系统溶剂法提取，硅胶干柱层析法进行化学成分分离。
Method: Systematic solvent method is used to extract and silica gel dry column sheet gradation was used to separate the chemical composition.
方法：采用系统溶剂法提取，硅胶干柱层析法进行化学成分分离。
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