Note: English document identification code should correspond to Chinese. [Reference Type ID] M Monograph Monograph; C- set; Prose; N news; Paper article news; Periodical articles and periodicals; D degree thesis degree; R report report; S standard standard; P patent; ; Literature precipitated in monographs and papers; Z Other unspecified documents (1) Document type identification: monograph [m]; Periodical [j]; Essay [c]; Dissertation [d]; Standard; Report [r]; Patent [p]; Newspapers; (2) Electronic document type identification: database [DB]; Computer program; Electronic bulletin; (3) carrier type and identification of electronic documents: online database [DB/OL];

The publishing format of national periodicals requires that the document identification code be marked below the classification number of China Library Classification, as follows: the author can choose one of the following identification codes to reveal the nature of the article: a theoretical and applied research academic paper (including summary report); B report on practical achievements (science and technology), theoretical study and summary of social practice (science and technology); C articles on business guidance and technical management (including special comments); General newsletters, reports, interviews, etc. ; E documents, materials, figures, books and periodicals, knowledge introduction, etc. Note: English document identification code should correspond to Chinese. [Reference Type ID] M Monograph; ; C- set; Prose; N news; Paper article news; Periodical articles and periodicals; D degree thesis degree; R report report; S standard standard; P patent; ; Literature precipitated in monographs and papers; Z Other unspecified documents (1) file type identification: monograph [m]; Periodical [j]; Essay [c]; Dissertation [d]; Standard; Report [r]; Patent [p]; Newspapers; (2) Electronic document type identification: database [DB]; Computer program; Electronic bulletin; (3) carrier type and identification of electronic documents: online database [DB/OL];