After editing and processing, the spine of each book is affixed with a book label, and the content displayed on the book label is the "claim number" of the book, which consists of two parts: the classification number and the author number, and consists of English letters and numbers respectively. The books on the shelf are arranged in alphabetical order first, and then in numerical order. The order on the shelf is from top to bottom, from left to right, from small to large. Readers can search on the shelves according to the request number of each book. The classification of China Library Classification is as follows: A: Marxism-Leninism, Mao Zedong Thought, Deng Xiaoping Theory; B: philosophy and religion; C: introduction to social science; D: politics and law; E: military; F: economy; G: culture, science, education and sports; H: language and writing; I: literature; J: art; K: history and geography; N: introduction to natural science; O: mathematical science and chemistry; P: astronomy, earth science; Q: Biological science; R: medicine and health; S: agricultural science; T: industrial technology; U: transportation; Five: aerospace; X: environmental science and safety science; Z: comprehensive books; Attachment: Class T subdivision: TB: general industrial technology; TD: mining engineering; TE: oil and gas industry; TF: metallurgical industry; TG: metallurgy and metal technology; TH: mechanical instrument industry; TJ: weapons industry; TK: energy and power engineering; TL: atomic energy technology; TM: electrical technology; TN: radio electronics and telecommunications technology; TP: Automation and Computer Technology; TQ: chemical industry; TS: light industry, handicraft industry; Tu: architectural science; Television: water conservancy project;