以类型的形式赋予档案实体的用以固定和反映档案排列顺序的一组代码。
·2,447,543篇论文数据，部分数据来源于NoteExpress
在分析外部数据的来源及特点上，提出了排架分类号与单纯检索用分类号的质量控制措施。
This paper analyzes on the origins and the characteristics of the exterior data, and puts forward some measures for the quality control of shelving category number and searching category number.
在分析外部数据的来源及特点上，提出了排架分类号与单纯检索用分类号的质量控制措施。
This paper analyzes on the origins and the characteristics of the exterior data, and puts forward some measures for the quality control of shelving category number and searching cat...
不同中图分类号论文的回归模型表明，文摘字数随论文篇幅的变化率为0.021～0.044；
Regression model showed that the variation of abstract word number was 0.021 ~ 0.044 with thesis length.
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