Periodical papers, patent documents, scientific and technological reports, meeting minutes and dissertations belong to the first-class documents.
Contents, indexes and abstracts belong to secondary literature.
Summary, comments and comments belong to three documents.
Literature can be divided into first-class literature, second-class literature and third-class literature according to its content, nature and processing mode. Primary literature refers to the original literature created on the basis of the author's own research results, such as periodical papers, research reports, patent specifications, conference papers, etc. Secondary literature refers to primary literature.
Generally speaking, undergraduate graduation thesis should include title, table of contents, abstract, key words, text, conclusion, references, thanks and appendix. Among them, because of the table of contents, abstracts, etc. Both are supplementary explanations and summaries of the words. The requirement of two words is to ensure that the theme of the paper is fully displayed and the content is complete, so only words can be counted in the required number of words.
The text can contain factual basis, relevant discussions and the author's own analysis, argumentation and conclusion. If the number of words is not enough, we can enrich it from these three aspects, and give a few more examples for comparative analysis.