这里是一张某个网友认为自己所能涉及的DDC分支，所谓涉及，我认为仅仅是知道和了解的层次。
000 Computer science, information & general works
003 Systems
004 Data processing & computer science
005 Computer programming, programs & data
006 Special computer methods
020 Library & information sciences
030 General encyclopedic works
050 General serial publications
060 General organizations & museum science
070 News media, journalism & publishing
080 General collections
090 Manuscripts & rare books
096 Books notable for illustrations
100 Philosophy & psychology
101 Theory of philosophy
110 Metaphysics
116 Change
117 Structure
120 Epistemology, causation & humankind
121 Epistemology
122 Causation
123 Determinism & indeterminism
124 Teleology
126 The self
127 The unconscious & the subconscious
128 Humankind
129 Origin & destiny of individual souls
130 Parapsychology & occultism
131 Parapsychological & occult methods
135 Dreams & mysteries
138 Physiognomy
140 Specific philosophical schools
143 Bergsonism & intuitionism
146 Naturalism & related systems
150 Psychology
152 Perception, movement, emotions & drives
153 Mental processes & intelligence
154 Subconscious & altered states
155 Differential & developmental psychology
160 Logic
170 Ethics
180 Ancient, medieval & eastern philosophy
181 Eastern philosophy
186 Skeptic & Neoplatonic philosophies
190 Modern western philosophy
200 Religion
210 Philosophy & theory of religion
220 Bible
270 History of Christianity & Christian church
300 Social sciences
301 Sociology & anthropology
302 Social interaction
303 Social processes
304 Factors affecting social behavior
307 Communities
310 Collections of general statistics
330 Economics
350 Public administration
366 Associations
367 General clubs
369 Miscellaneous kinds of associations
370 Education
380 Commerce, communications & transportation
381 Commerce
382 International commerce
384 Communications; telecommunication
387 Water, air & space transportation
388 Transportation; ground transportation
390 Customs, etiquette & folklore
400 Language
410 Linguistics
420 English & Old English
440 Romance languages; French
495 Languages of East & Southeast Asia
500 Natural sciences & mathematics
510 Mathematics
520 Astronomy & allied sciences
530 Physics
540 Chemistry & allied sciences
550 Earth sciences
560 Paleontology; paleozoology
570 Life sciences; biology
580 Plants (Botany)
590 Animals (Zoology)
600 Technology
610 Medicine & health
620 Engineering & allied operations
623 Military & nautical engineering
624 Civil engineering
625 Engineering of railroads & roads
629 Other branches of engineering
630 Agriculture & related technologies
640 Home & family management
650 Management & auxiliary services
652 Processes of written communication
657 Accounting
658 General management
659 Advertising & public relations
660 Chemical engineering
670 Manufacturing
671 Metalworking & primary metal products
675 Leather & fur processing
676 Pulp & paper technology
680 Manufacture for specific uses
683 Hardware & household appliances
684 Furnishings & home workshops
686 Printing & related activities
688 Other final products & packaging
690 Buildings
700 The arts; fine & decorative arts
710 Civic & landscape art
711 Area planning
720 Architecture
725 Public structures
729 Design & decoration
730 Plastic arts; sculpture
741 Drawing & drawings
742 Perspective
743 Drawing & drawings by subject
748 Glass
749 Furniture & accessories
750 Painting & paintings
751 Techniques, equipment, materials & forms
752 Color
753 Symbolism, allegory, mythology & legend
754 Genre paintings
757 Human figures
758 Other subjects
760 Graphic arts; printmaking & prints
770 Photography, photographs & computer art
771 Techniques, equipment, materials
778 Fields & kinds of photography
780 Music
782 Vocal music
784 Instruments & instrumental ensembles
786 Keyboard & other instruments
787 Stringed instruments
790 Recreational & performing arts
791 Public performances
792 Stage presentations
793 Indoor games & amusements
794 Indoor games of skill
796 Athletic & outdoor sports & games
797 Aquatic & air sports
800 Literature & rhetoric
801 Philosophy & theory
820 English & Old English literatures
830 Literatures of Germanic languages
840 Literatures of Romance languages
850 Italian, Romanian & related literatures
895 Literatures of East & Southeast Asia
900 History & geography
909 World history
910 Geography & travel
912 Atlases, maps, charts & plans
940 History of Europe
950 History of Asia; Far East
951 China & adjacent areas
确实相当浩瀚，可以感受到自己的渺小了。看看中国图书馆分类法吧：
A上表就明显过于笼统，不易有熟悉的感觉，但是也让人觉得“至少这些分类还都是熟悉的”，自我满足一下。
马克思主义、列宁主义、毛泽东思想、邓小平理论
B
哲学、宗教
C
社会科学总论
D
政治、法律
E
军事
F
经济
P
天文学、地球科学
Q
生物科学
R
医药、卫生
U
交通运输
S
农业科学
V
航空、航天
G
文化、科学、教育、体育
H
语言、文字
I
文学
J
艺术
K
历史、地理
N
自然科学总论
O
数理科学和化学
T
工业技术
TB
一般工业技术
TD
矿业工程
TE
石油、天然气工业TFTN
冶金工业
TG
金属学与金属工艺
TH
机械、仪表工业
TJ
武器工业
TK
能源与动力工程
TL
原子能技术
TM
电工技术
无线电电子学、电信技术
TP
自动化技术、计算机技术
TQ
化学工业
TS
轻工业、手工业
TU
建筑科学TV
水利工程X
环境科学、安全科学
Z
综合性图书
依据本人目前的知识结构，仅仅局限在工业技术－－》电子和电信工程－－》电信网络，而且又不是很拿得出手，可见有多自卑了吧。
没办法，脑子开窍太晚，现在能做的就是在现在的基础上把电这块的工程好好打扎实，然后选择慢慢扩展自己感兴趣的内容继续努力扩充自己的知识。
可以选择的方向：
广告和公共关系方向
历史（欧洲）＋中国历史
文学（诗歌）
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