Book classification is to organize books according to the content and writing style according to the pre-established classification system. It is a new book classification compiled under the background of traditional classification at home and abroad.
Since the publication of 1975, China Library Classification has had a far-reaching impact on modern library cause. After 1980s, the mainstream book classification method replaced other classification methods, which was almost universal. Stimulated by culture, workplace policy and publishing market, the amount of literature information has increased rapidly. As a logical method, the principle of scientific classification of books is unchanged, and "practicality" is the highest principle.
The basic categories (22 basic categories) of Chinese Library Classification are as follows:
A. Marxism-Leninism, ideology and theory? B. philosophy?
C, Introduction to Social Sciences D, Politics and Law
E. military? F. Economy
G, culture, science, education, sports? H, language and writing?
First, literature? J.art?
K. historical geography? Introduction to natural science
O, mathematical chemistry p, astronomy, earth science?
Q, biological science? R, medicine, health
S, agriculture? T, industrial technology
Unit transportation? V. Aviation and aerospace
X, environmental science, labor protection science (safety science) z, comprehensive books
Therefore, according to the classification of books in China Library, books about automobile engines should be searched under the classification of U-shaped transportation.