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What does the book classification number R- 1 stand for?
R- 1 stands for current situation and development.

Book classification: R-0 general theory, R- 1 current situation and development, R-3 medical research methods, R 1 preventive medicine, hygiene, R2 China medicine, R3 basic medicine, R4 clinical medicine, R5 internal medicine, R6 surgery, R7 1 obstetrics and gynecology, R72 pediatrics, R73 tumor.

Classification number is to classify each book and give each book a number according to China Library Classification.