I happen to work in the library. \x0d\ classified summary: \x0d\A Marxism-Leninism, Mao Zedong Thought, Deng Xiaoping Theory \x0d\B Philosophy, religion \x0d\C Introduction to social sciences \x0d\D Politics, law \x0d\E Military \x0d\F Economy \x0d\G Culture and science. K History, Geography \ x0d \ nGeneral Theory of Natural Science \x0d\O Mathematical Science and Chemistry \x0d\P Astronomy, Earth Science \x0d\Q Biological Science \x0d\R Medicine, Health \x0d\S Agricultural Science \x0d\T Industrial Technology \x0d\U Transportation \ it.