The details are as follows: 1. Philosophy, religion, social science, politics, law, military, economy, culture, science, education, sports, language, writing, literature, art, history, geography and natural science of Mao Zedong Thought and Deng Xiaoping Theory, and library classification of China.
O mathematical chemistry p astronomy, earth science q biological science r medicine, health s agricultural science t industrial technology u transportation v aviation, aerospace x environmental science, safety science z comprehensive books.
TU: building science u: transportation TP: automation technology, computing technology.
A single letter belongs to the big category, and painting belongs to the second category under the big category. For details, please refer to the following address: