It divides subjects into five categories, 22 major categories, and the basic sequence is:
Marxism, Leninism, Mao Zedong Thought, Philosophy, Social Sciences, Natural Sciences, Comprehensive Books,
Marxism, Leninism, Mao Zedong Thought
A Marxism, Leninism, Mao Zedong Thought
1 Marx, Engels works
11 Selected works and collections
12 Single-authored works
121 The period of the formation of Marxism (-1847)
122 The period of high and low revolutionary storms (1848-1863)
123 The period of the First International and the Paris Commune (1864-1872)
124 The period of the widespread dissemination of Marxism and the establishment of socialist parties in various countries
124 The period of Marxist Period of Widespread Dissemination and Establishment of Socialist Parties in Various Countries (1873-June 1889)
125 Period of the Second International (July 1889-1895)
13 Epistolary Collections, Diaries, Correspondence and Conversations
14 Poetry
15 Handwriting
16 Compilation of Topical Issues
18 Quotations<
2 Lenin's Writings
21 Selected Works, Collected Works
22 Single-Line Writings
23 Epistles, Diaries, Correspondence, and Talks
25 Handwriting
26 Thematic Compilations
28 Quotations
3 Stalin's Writings
31 Selected Works, Collected Works
32 Single-volume works
33 Epistles, diaries, letters, conversations
35 Handwriting
36 Topical compilations
38 Quotations
4 Mao's writings
41 Selected works, collections
42 Single-volume writings
421 Prior to the First Revolutionary War (-1924)<
422 Period of the First Domestic Revolutionary War (1924-July 1927)
423 Period of the First Domestic Revolutionary War (August 1927-June 1937)
424 Period of the Resistance Against Japan (July 1937-August 1945)
425 Period of the Third Domestic Revolutionary War ( September 1945-September 1949)
426 Period of Socialist Revolution and Socialist Construction
43 Collected Letters, Diaries, Correspondence and Talks
44 Poetry
45 Handwriting
46 Compilation of Topical Issues
48 Quotations
5 Marx, Engels, Lenin and Stalin, Mao Zedong
56 Topical compilation
58 Quotations
7 Lives and biographies of Marx, Engels, Lenin, Stalin, and Mao
71 Marx
72 Engels
73 Lenin
74 Stalin
75 Mao Zedong
8 Study and Research of Marxism, Leninism and Mao Zedong Thought
81 Study and Research of the Writings of Marx and Engels
82 Study and Research of the Writings of Lenin
83 Study and Research of the Writings of Stalin
84 Study and Research of the Writings of Mao Zedong
85 Study and Research of Compendium of Writings
Philosophy
B Philosophy
0 Philosophical Theory
0-0 Marxist Philosophy (General)
1 Fundamental Problems of Philosophy
2 Dialectical Materialism
21 The Theory of Matter
22 Theory of Consciousness
23 Epistemology, Reflection
24 Dialectic of Materiality
25 Categories of material dialectics
26 Methods of thought and methods of work
27 Applications of dialectical materialism
3 Historical materialism (materialist conception of history)
8 Philosophical schools and their study
81 Idealism
82 Positivism, empirical criticalism (Machism)
p> 83 Voluntarism, Philosophy of Life
84 Neo-Kantian Attention, Neo-Hegelianism
85 Neo-positivism, Logical Positivism (Neo-Positivism, Logical Empiricism)
86 Existentialism (Existentialism)
87 Pragmatism
88 Neo-Thomism (Neo-Transcendentalism)
89 Other Schools of Philosophy
1 World Philosophy12 Ancient Philosophy13 Medieval Philosophy14 Modern Philosophy15 Modern Philosophy
17 The Spread and Development of Marxist Philosophy
2 Chinese Philosophy
20 Materialism and Idealism (General)
22 Pre-Qin Philosophy221 Pre-Zhuzi 222 Confucianism223 Taoism
224 Mohism225 Nominalism226 Legalism227 Yin-Yangism228 Vertical and Longitudinalism
229 Miscellaneous Schools
232 Philosophy of the Qin and Han Dynasties (General) (221 BCE-220 CE)233 Philosophy of the Qin Dynasty (221-207 BCE)
234 Philosophy of the Han Dynasty (206 BCE-220 CE)235 Philosophy of the Three Kingdoms, Jin, and Northern and Southern Dynasties (220-589) 241 Philosophy of the Sui, Tang, and Five Dynasties (581-960)
244 Philosophy of the Song and Yuan Dynasties (960-1368) 248 Philosophy of the Ming Dynasty (1368-1644) 249 Philosophy of the Qing Dynasty (1644-1840)
25 Modern Philosophy (1840-1918) 26 Modern Philosophy (1919-)
27 The Spread and Development of Marxist Philosophy in China
3 Philosophy in Asia
302 Ancient Philosophy (Asia) 303 Medieval Philosophy (Asia) 304 Modern Philosophy (Asia)
305 Modern Philosophy (Asia) 307 The Spread and Development of Marxist Philosophy in Asia<
31 East Asian Philosophy 33 Southeast Asian Philosophy (I)
34 Southeast Asian Philosophy (II)35 South Asian Philosophy
36 Central Asian Philosophy 37 West Asian Philosophy (I)38 West Asian Philosophy (II)
4 Philosophy of Africa
402 Ancient Philosophy (Africa) 403 Medieval Philosophy (Africa) 404 Modern Philosophy (Africa)
405 Modern Philosophy (Africa) 407 Spread and Development of Marxist Philosophy in Africa
41 North African Philosophy 42 East African Philosophy 43 West African Philosophy (I) 44 West African Philosophy (II)
45 West African Philosophy (III) 46 Central African Philosophy 47 South African Philosophy (I) 48 South African Philosophy (II)
5 European Philosophy
502 Ancient Philosophy (Europe) 503 Medieval Philosophy (Europe) 504 Modern Philosophy (Europe)
505 Modern Philosophy (Europe) 507 Diffusion and Development of Marxist Philosophy in Europe
51 Eastern and Central European Philosophy (I) 52 Eastern and Central European Philosophy (II)
53 Nordic Philosophy 54 Southern European Philosophy (I) 55 Southern European Philosophy (II) 56 Western European Philosophy
6 Oceania Philosophy
7 Philosophy of the Americas
80 Science of Thinking (General)
81 Logic (Theory)
0 General 811 Dialectical Logic 812 Formal Logic (Nominal and Dialectical)
[813] Mathematical Logic (Symbolic Logic) (suitable for inclusion in O141 ) [814] Probabilistic Logic
815 Philosophical Logic (Non-Classical Logic) 819 Applied Logic
82 Ethics (Moral Philosophy)
0 General 821 Outlook on Life, Philosophy of Life 822 Ethics of the State 823 Ethics of the Family, Marriage
824 Social Morality 825 Personal Virtues
83 Aesthetics
0 General Studies
832 Aesthetics and Social Production 832 Aesthetics and Real Social Life [835] Aesthetics of Art (preferably into J01)
84 Psychology
0 General Studies
841 Methods of Research in Psychology 842 Psychological Processes and Psychological Practices 843 Occurrence Psychology
844 Developmental Psychology (Human Psychology) 845 Physiological Psychology
846 Altered Psychology, Pathological Psychology, Superconscious Psychology 848 Individualistic Psychology, Personality Psychology
849 Applied Psychology
9 Atheism, Religion
91 Atheism 92 Religion 93 Myths and Primitive Religions 94 Buddhism 95 Taoism
96 Islam ( Islam) 97 Christianity 98 Other Religions 99 Superstitious Magic
Social Sciences
C General Introduction to the Social Sciences
0 Theory and Methodology of the Social Sciences
1 Current Situation of the Social Sciences, General Information
2 Organs, Groups, Conferences
3 Research Methods in the Social Sciences
4 Social Science Education and Pu 5 Social Science Series, Anthologies, Continuous Publications
51 Series (Repertoire) 52 Complete Works, Anthologies 53 Collections, Proceedings 54 Yearbooks, Annuals
55 Continuous Publications, Periodicals
6 Social Science Reference Tools
[7] "Social Science Literature Search Book (Please check G257.33,Z88/89)"
8 Statistics
81 Statistical Methods
[82] Specialized Statistics (appropriate for inclusion in related disciplines)
83 Statistics of the World Countries
91 Society 92 Demography 93 Management
[94] Systems Theory (systematics, systems engineering) (check N94)
96 Talent Science
D Politics, Law
0 Political Theory
1/3 ****productivist movement, ****productivist party
1 International ****productivist movement 2 Chinese ****productivist party, ****productivist youth league 3 ****productivist parties in various countries
4 Workers', peasants', youth, and women's movements and organizations
5 World Politics
< p> 6 Politics of China7 Politics of Various Countries
73 Politics of Asia 74 Politics of Africa 75 Politics of Europe 76 Politics of Oceania
77 Politics of the Americas
8 Diplomacy, International Relations
9 Law
E Military
0 Military Theory 1 World Military 2 Chinese Military
3/ 7 Military of Various Countries
3 Military of Asia 4 Military of Africa 5 Military of Europe 6 Military of Oceania 7 Military of the Americas
8 Strategy, Tactics, Battle
9 Military Technology 99 Military Topography, Military Geography
F Economy
0 Political Economy 1 Economic Overview of the World's Economies, Economic History, Economic Geography 2 Economic Planning and Management
3 Agricultural Economy
3 Agricultural Economy 4 Industrial Economy 5 Transportation Economy 6 Somewhat Economy
7 Trade Economy 8 Finance, Finances
G Culture, Science, Education, Sports
0 Cultural Theory
1 Overview of cultural endeavors of countries around the world11 World Military 12 Chinese Military 13 Asian Military
14 African Military 15 European Military 16 Oceania Military 17 Americas Military
2 Information and Knowledge Dissemination
3 Science, Scientific Research
4 Education
4 Education 5 Educational endeavors around the world 6 Education at all levels 7 Education of all kinds
8 Sports
H Languages, scripts
0 Linguistics
1 Chinese language
2 Chinese ethnic minorities
2 Chinese Minority Languages
3 Common Foreign Languages31 English32 French33 German34 Spanish35 Russian
36 Japanese37 Arabic
4/84 Languages of Various Language Families
4 Sino-Tibetan Languages5 Altaic Languages (Turkic-Mongolian-Tongkus)
61 South Asian Languages 62 South Indian South Asian languages62 South Indian languages (Dravidian, Dravidian)
63 South Island languages (Malayo-Polynesian)
64 North-east Asian languages
65 Ibero-Caucasian languages66 Finno-Ugric languages67 Semi-Hamitic languages
7 Indo-European languages81 African languages83 American languages84 Oceanic languages
9 International Auxiliary Languages
I Literature
0 Literary Theory
1 World Literature
2 Chinese Literature
3/7 Literature of Various Countries 3 Asian Literature 4 African Literature 5 European Literature
6 Oceanic Literature 7 Literature of the Americas
J Art
0 Theory of Art
1 Overview of Art of Various Countries 2 Paintings 29 Calligraphy Art Overview by Country 2 Painting 29 Calligraphy, Seal Engraving
3 Sculpture 4 Photographic Arts 5 Arts and Crafts
[59] Architectural Arts (check TU-8)
6 Music 7 Dance 8 Theatre Arts
9 Film and Television Arts
K History and Geography
0 Theory of History
1 World History
2 History of China
3/7 History of Nations
3 History of Asia 4 History of Africa
5 History of Europe 6 History of the Oceanic States 7 History of the Americas
81/83 Biographies
81 Biographies of the World's Characters and the Study and Preparation of Biographies 82 Biographies of the Chinese Characters
83 Biographies of Nations
85/88 Archaeology of Cultural Relics
85 Archaeology 86 Archaeology of Cultural Relics in the World 87 Archaeology of Cultural Relics in China
88 Archaeology of Cultural Relics in Various Countries
89 Customs and Habits
9 Geography
Natural Sciences
N General Introduction to Natural Sciences
0 Theory and Methodology in Natural Sciences 1 Current Situation and Overview of Natural Sciences
2 Natural Science Organs, Groups, Conferences 3 Natural Science Research Methods
4 Natural Science Education and Popularization 5 Natural Science Series, Anthologies, Continuous Publications
6 Natural Science Reference Tools [7] "Natural Science Literature Retrieval Toolkit (Please check G257.36,Z88/89)"
8 Natural Science Survey, Expedition 91 Natural Research , natural history
94 Systems theory (systematics, systems engineering) [99] Intelligence, intelligence work (look up G35)
O Mathematical sciences and chemistry
1 Mathematics
11 Classical mathematics 12 Elementary mathematics
13 Higher mathematics 14 Mathematical logic, foundations of mathematics 15 Algebra, number theory, combinatorial theory
17 Mathematical analysis 18 Geometry, topology
19 Integral analysis, analysis on manifolds 21 Probability theory, mathematical statistics
22 Operational research 23 Cybernetics, information theory (mathematical theory)
24 Computational mathematics 29 Applied mathematics
3 Mechanics
31 Theoretical mechanics (general mechanics 32 Vibration theory
< p> 33 Mechanics of continuous media (mechanics of deformable bodies) 34 Mechanics of solids 35 Fluid mechanics369 Physical mechanics 37 Rheology 38 Explosive mechanics 39 Applied mechanics
4 Physics
41 Theoretical physics 42 Acoustics 43 Light 44 Electromagnetism, electrodynamics
45 Radio physics 46 Vacuum electronics (electron physics )
47 Semiconductor Physics48 Solid State Physics51 Low Temperature Physics
52 High Pressure and High Temperature Physics53 Plasma Physics55 Thermal and Molecular Theory of Motion of Matter
56 Molecular Physics, High Energy Physics59 Applied Physics
6 Chemistry
61 Inorganic Chemistry62 Organic Chemistry63 Polymer Chemistry (Polymers)
64 Physical Chemistry (Theoretical Chemistry), Chemical Physics 65 Analytical Chemistry 69 Applied Chemistry
7 Crystallography
P Astronomy, Earth Sciences
1 Astronomy 2 Surveying and Mapping 3 Geophysics 4 Meteorology 5 Geology
6 Geology (II) 7 Oceanography 9 Physical Geography
Q Biological Sciences
1 General Biology 2 Cytology 3 Genetics 4 Biology 5 Biochemistry
6 Biophysics 7 Molecular Biology 81 Bioengineering[89] Environmental Biology (check X17)
91 Paleontology 93 Microbiology 94 Botany 95 Zoology 96 Entomology 8 Anthropology
R Medicine, Health
1 Preventive Medicine, Hygiene 2 Chinese Medicine 3 Basic Medicine 4 Clinical Medicine
5 Internal Medicine 6 Surgery 71 Obstetrics and Gynecology 72 Pediatrics
73 Oncology 74 Neurology and Psychiatry 75 Dermatology and Venereal Disease 76 Otorhinolaryngology 77 Ophthalmology
78 Oral Science
79 Foreign Ethnic Medicine
8 Specialty Medicine
9 Pharmacy
S Agricultural Sciences
1 Agricultural Basic Sciences 2 Agricultural Engineering 3 Agronomy (Agronomy) 4 Plant Protection
5 Crops 6 Horticulture 7 Forestry 8 Animal Husbandry, Veterinary Medicine, Hunting, Silkworms, and Beekeeping 9 Aquaculture and Fisheries
T Industrial Sciences
TB General Industrial Technology
p> 1 Basic Engineering Science
2 Engineering Design and Mapping
3 Engineering Materials Science
[31] Metallic Materials (look up TG4)
32 Non-Metallic Materials
33 Composite Materials
35 Low-Temperature Resistant Materials, High-Temperature Resistant Materials
37 Corrosion Resistant Materials
39 Other special performance materials
4 General industrial technology and equipment
41 Blasting technology
42 Sealing technology
43 Thin film technology
44 Powder technology
48 Packaging engineering
49 Plants, workshops
5 Acoustic engineering
6 Refrigeration engineering
7 Vacuum engineering
7 Vacuum Technology
8 Photographic Technology
9 Metrology
TD Mining Engineering
1 Mining Geology and Surveying
2 Mining Design and Construction
3 Mining Pressure and Support
4 Mining Machinery
5 Mining Transportation and Equipment
6 Mining Electricians
7 Mining Safety and Labor Protection
8 Mining
9 Mineral Processing
TE Oil and Gas Industry
1 Oil and Gas Geology and Exploration
2 Drilling Engineering
3 Oil and Gas Field Development and Extraction
5 Offshore Oil and Gas Field Development and Extraction
6 Oil and gas processing industry
8 Oil and gas storage and transportation
9 Petroleum machinery and equipment and automation
[99] Environmental Protection and Comprehensive Utilization in the Oil and Gas Industry (suitable for inclusion in X74)
TF GOLD INDUSTRY
0 GENERAL
1 Metallurgical technology
3 Metallurgical Machinery, automation of metallurgical production
4 Iron and steel smelting (ferrous metal smelting) (general)
5 Ironmaking
6 Ferroalloy smelting
7 Steelmaking
79 Smelting of other ferrous metals
8 Non-ferrous metal smelting
TG Metallurgy, Metal Processes
1 Metallurgy, heat treatment
2 Casting
3 Metal Pressure Processing
4 Welding, Metal Cutting and Bonding
5 Metal Cutting Machines and Machine Tools
7 Cutting Tools, Abrasives, Grinding Tools, Jigs, Moulds and Die, Hand Tools
8 Tolerance and Technical Measurement and Mechanical Measuring Instrumentation
9 Clamping Craftsmanship, Assembly Process
TH Mechanical and Instrumentation Crafts
11 Mechanics (Basic Theory of Mechanical Design)
12 Mechanical Design, Calculation and Drawing
13 Mechanical Parts and Transmissions
14 Materials for Mechanical Manufacturing
16 Mechanical Manufacturing Crafts
17 Operation and Maintenance
18 Mechanical Factory (Workshop)
2 Lifting and Transportation Machinery
3 Pumps
4 Gas Compression and Conveying Machinery
6 Special Purpose Machinery
7 Instrumentation and Instrumentation
TJ Weapons Industry
0 General Issues
2 Guns
3 Guns
4 Ammunition, Fuzes, and Pyrotechnic Products
5 Demolition Equipment, Pyrotechnic Equipment, Fire Explosives
6 Waterborne Weapons
7 Rockets, Missiles
8 War Vehicles, Battleships, Fighter Aircraft, Space Weapons
9 Nuclear Weapons and Other Special Weapons and Protective Equipment
TK Power Industry
0 General
1 Thermal Engineering, Thermal Machines<
2 Steam Power Engineering
3 Thermal Measurement and Thermal Automation
4 Internal Combustion Engine Engineering
5 Special Thermal Energies and Their Utilization
6 Biological Energies and Their Utilization
7 Hydraulic Energies, Hydraulic Machinery
8 Wind Energies, Wind Machinery
91 Hydrogen Energies and Their Utilization
TL Atomic Energy Technology
1 Basic Theory
2 Nuclear Fuel and its Production
3 Nuclear Reactor Engineering
4 Various Nuclear Reactors, Nuclear Power Plants
5 Accelerators
6 Controlled Thermonuclear Reactions (Fusion Reaction Theory and Experimental Devices)
7 Radiation Protection
8 Tevatron Detection Technologies, Radiation Detection Technology and Nuclear Instrumentation
91 Nuclear Explosions
92 Production and Preparation of Radioisotopes
929 Sources of Radiation
93 Packaging, Transportation, and Storage of Radioactive Substances
94 Management and Comprehensive Utilization of Radioactive Waste
99 Applications of Atomic Energy Technology
TM Electrotechnology
0 General Issues
1 Basic Theory of Electrotechnology
2 Electrotechnical Materials
3 Electric Motors
4 Transformers, Converters and Reactors
5 Electrical Appliances
6 Power Generation, Power Plants
7 Transmission and Distribution Engineering, Power Networks and Power Systems
8 High-Voltage Technology
91 Independent power technology (direct power generation)
92 Electrification, electrical energy applications
93 Electrical measurement technology and instrumentation
TN Radioelectronics, telecommunication technology
0 General
1 Vacuum electronics
2 Optoelectronics, laser technology
3 Semiconductor technology
4 Microelectronics, integrated circuits (IC)
6 Electronic components, assemblies
7 Basic electronic circuits
8 Radio, telecommunication equipment
91 Communications
92 Wireless communications
93 Radio
94 Television
95 Radar<
96 Radio Navigation
97 Electronic Countermeasures (Jamming and Anti-Jamming)
[98] Radio and Telecommunications Measurement Techniques and Instrumentation (check TM93)
99 Applications of Radio Electronics
TP Automation Technology, Computing Technology
1 Basic Theory of Automation
11 Automation System Theory
13 Automation Control Theory
14 Automatic Information Theory
15 Automatic Simulation Theory (Automatic Simulation Theory)
17 Switching Circuit Theory
18 Artificial Intelligence Theory
2 Automation Technology and Equipment
20 General Issues
21 Automation Components, parts
23 Automation devices and equipment
24 Robotics
27 Theory of automation systems
29 Applications of automation technology in various areas
3 Computing technology, computers
30 General issues
31 Computer software
32 General Calculators and computers
33 Electronic digital computers (discontinuous-action electronic computers)
34 Electronic analog computers (continuous-action electronic computers)
35 Hybrid electronic computers
36 Microcomputers
38 Other computers
39 Applications of computers
6 JET TECHNOLOGY (FLOW CONTROL TECHNOLOGY)
60 GENERAL
61 JET ELEMENTS
62 JET ACCESSORIES
63 DETECTING AND SENDING DEVICES
64 ACTUATING MECHANISMS
65 POWER SOURCES
66 JET CONTROL LINES
67 AUTOMATIC JET CONTROL SYSTEMS
69 Applications of jet technology
7 Remote sensing technology
70 General issues
72 Remote sensing modalities
73 Detection instrumentation and systems
75 Interpretation, recognition and processing of remotely sensed images
79 Applications of remote sensing technology
8 Remote sensing technology
80 General issues
[81] Components, parts (suitable for inclusion in TP21)
83 Telematics
84 Channels
87 Telematics systems
89 Telematics in various applications
TQ Chemical industry
0 General questions
1 Basic theory
2 Chemical Processes (Physical and Physico-Chemical Processes)
3 Chemical Reaction Processes
4 Chemical Raw Materials, Auxiliary Materials
5 Chemical Machinery and Equipment
6 Chemical Manufacturing Processes, Final Handling, and Packaging
7 Chemical Products and By-Products
8 Chemical Plants
[09] Treatment of Waste from Chemical Industry and Comprehensive Utilization (appropriate to X78)
11 Basic Inorganic Chemical Industry
110 General
111 Production of Inorganic Acids
113 Ammonia and Ammonium Salt Industry
114 Chlor-alkali Industry
115 Inorganic Salt Industry
116 Industrial Gases
117 Specialty gases
118 Inorganic peracids and peracid salts
12 Chemical industry of non-metallic elements and their inorganic compounds13 Chemical industry of inorganic compounds of metallic elements
15 Electrochemical industry16 Electrothermal industry, high-temperature products industry
17 Silicicates industry2 Basic organic chemical industry
31 Polymer compounds industry ( Polymer Industry)
32 Synthetic Resin and Plastic Industry 33 Rubber Industry
34 Chemical Fiber Industry
35 Chemical Processing of Fiber Qualities Industry 41 Production of Solvents and Plasticizers
42 Production of Reagents and Pure Chemicals 43 Adhesive Industry
44 Chemical Fertilizer Industry
45 Pesticide Industry 46 Pharmaceutical Chemical Industry51 Fuel Chemical Industry
52 Coking Chemical Industry
53 Coal Chemistry and Coal Processing and Utilization
54 Coal Vaporization Industry
55 Fuel Lighting Industry
56 Explosives Industry, Matchmaking Industry
57 Optical Materials Industry
58 Magnetic Recording Materials Industry
61 Dyestuffs and intermediates industry
62 Pigments industry
63 Coatings industry
64 Chemical processing industry of fats, oils and waxes, soap industry
65 Fragrances and cosmetic industry
9 Other chemical industries
TS Light industry, handicrafts
0 GENERAL
1 Textile industry, dyeing and finishing industry
2 Food industry
3 Salt industry
4 Tobacco industry
5 Leather industry
6 Wood-processing industry, furniture manufacturing industry
7 Paper industry
8 Printing industry
91 Hardware industry
p> 93 Arts and Crafts Manufacturing Industry
94 Clothing Industry, Footwear Manufacturing Industry
95 Other Light Industry, Handicrafts
97 Life Supply Technology
TU Building Science
1 Basic Building Science
19 Building Surveying
2 Building Design
3 Building Structure
4 Geotechnics, Foundation Engineering
5 Building Materials
6 Building Construction Machinery and Equipment
7 Building Construction
8 Building Equipment
9 Underground Construction
7 Tall Buildings
98 Regional Planning, Town Planning
99 Municipal Engineering
p> TV Hydraulic Engineering
1 Basic Coursework in Hydraulic Engineering
21 Water Data Survey and Hydraulic Planning
22 Hydraulic Surveying, Design
3 Hydraulic Structures
4 Hydraulic Materials
5 Hydraulic Construction
6 Hydraulic Hubs, Hydraulic Structures
7 Hydraulic Capacity Usage, Hydroelectric Power Station Engineering
8 River Management Engineering and Flood Control Engineering
[91] Canal (Canal, Channel) Engineering (Suitable for inclusion in U61)
[02] Harbor Engineering (Suitable for inclusion in U65)
[93] Agricultural Water Conservancy Engineering (Suitable for inclusion in S27)
U Transportation and Communications
1 Comprehensive Transportation
2 Railroad Transportation
4 Road Transportation
41 Road Engineering
44 Bridge and Culvert Engineering
45 Tunneling Engineering
46 Automotive Engineering
461 Automotive Theory
462 Design and Calculation of Complete Vehicles
463 Structural Components of Automotive Vehicles
464 Automotive Engine
465 Automotive Materials
466 Automotive Manufacturing Processes
467 Automotive Experimentation
468 Automotive Manufacturing Plants
469 Automobiles for Various Purposes
471 Driving and Use of Automobiles
472 Maintenance and Repair of Vehicles
473 Automotive Fuels and Lubricants
48 Other Roads and Roads p>
48 Other Road Transportation Vehicles
49 Management of Traffic Engineering and Road Transportation Technology
6 Waterway Transportation
[8] Air Transportation
V Aviation and Spaceflight
1 Research and Exploration of Aviation and Spaceflight Technology
11 Development of Aviation and Spaceflight and Space Exploration
19 Aviation
2 Aeronautics
21 Basic Theory and Experimentation
22 Aircraft Construction and Design
23 Aircraft Engines (Propulsion Systems)
24 Aeronautical Instruments, Equipment, Controls, and Navigation
25 Materials for Aeronautics
26 Aeronautical Manufacturing Processes
27 Spacecrafts of Various types of spacecraft
31 Fuel and lubricants for aviation
32 Aeronautical flight technology
35 Aerodromes, airports and technical management
37 Aeronautical systems engineering
4 Astronautics (cosmonautics)
41 Fundamental theories and experiments
42 Rocket and spacecraft construction (general)
43 Propulsion systems
4 Aerospace (spaceflight)
5 Aerospace (aerospace)
6 Aeronautical engineering
7 Spaceflight
8 Aerospace p>
43 Propulsion systems (engines, thrusters)
44 Instrumentation, equipment, guidance and control
[45] Materials for spaceflight (check V25)
46 Manufacturing processes
47 Spacecraft and their vehicles
51 Fuel (propellants) and lubricants for spaceflight
52 Astronautics
52 Spaceflight technology<
55 Ground Equipment, Test Sites, Launch Sites, Space Bases
57 Space Systems Engineering
[7] Aviation and Aerospace Medicine (appropriate to R85)
X Environmental Science
1 Basic Theory of Environmental Science
2 Comprehensive Research on Environment
3 Environmental Protection Management
4 Disasters and its prevention and control
5 Environmental pollution and its prevention and control
7 Treatment and comprehensive utilization of three wastes
8 Environmental quality evaluation and environmental monitoring
9 Labor protection science (safety science)
Comprehensive books
Z Comprehensive books
1 Series
2 Encyclopedias, class books
3 Thesaurus
4 Collections of essays, complete works, anthologies, miscellaneous works
5 Yearbooks, annuals
6 Periodicals, serials
8 Bibliographies, abstracts, indexes