首先，介绍了科恩归纳分级理论的产生背景。
Firstly, the backgrounds of Cohen's theory of inductive grading is introduced.
进而以流域分级理论为依据，将坡面、小流域、区域、全流域四个层次的模型整合成一个完整的流域整体模型。
The suggested model has four kinds of module, which are slope module, sub-basin module, region module and entire basin module.
对生丝抽样检验分级理论在柞蚕丝领域中的可行性进行了探讨，并根据这一理论对柞蚕水缫丝标准中纤度偏差指标进行了分析和等级区间划分；
On the basis of the theory, analyses and grade interval classification are conducted on the size deviation indices in the standard for water-reeled tussah silk.
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