Libraries classify books, which is convenient for management and service for readers. In China Library Classification, all knowledge classifications can be divided into 22 categories, and each category is represented by an English letter (A to Z), in which L, M, W and Y are not used to represent categories. In these letters, TP stands for computer, T stands for industrial technology, and P is the code of automation technology and computer technology in the subcategory of industrial technology. TP is just a book classification code, which represents the collection of all the documents about automation technology and computer technology in industrial technology.

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