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科技论文原稿，甚至公开出版物中时可见到分类的错误，集中表现为违背分类原则和混淆根据的所谓组合分类或综合分类。错误之所在：一是没有掌握分类的规则、方法；二是错误地以为类别分得愈多愈好，违反由繁→简，由散乱→系统的分类思维原则。通过实例进一步阐述了分类必须遵循的三项逻辑规则；剖析了所谓组合分类的错误；列举了反映复杂事物多因素分类的方法；演示了多种划分方法在分类中的灵活运用；强调了分类必须力求反映研究对象的本质属性和显著特征。
Scientific and technical papers, or even public publications can be seen when the classification errors, focused on the contrary to the principle of classification and confusion based on the so-called combined classification or comprehensive classification. The mistakes are: First, there is no rules and methods for classification; second, it is wrong to think that the more you divide the category, the more violent the rules of classification, the simple rules and the scattered rules of the system. Through the examples, we further elaborate the three logic rules which must be followed in the classification, analyze the errors of the so-called combinatorial classification, enumerate the methods that reflect the multi-factor classification of complex things, demonstrate the flexible application of multiple methods in classification, Strive to reflect the nature of the study object and salient features.