Basic structure of classification

(1) Basic categories: For example, China Library Classification is divided into five categories: Marxism-Leninism, Mao Zedong and Deng Xiaoping; Philosophy; Social science; Natural science; Comprehensive books.

(2) Basic category: the first category that constitutes the classification table. There are 22 basic categories in China Library Classification.

Teaching AIDS belong to 12 basic categories and 22 main categories:

Among them, category G: culture, science, education and sports.

G0 Cultural Theory G 1 Culture and Cultural Undertakings in the World G2 Information and Knowledge Dissemination G3 Science and Research G4 Education G8 Sports