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数符号
space	numerical symbol
tech.	numeric symbol

数符号: 137 phrases in 24 subjects

Advertising	2
Agriculture	4
Air defense	1
Artificial intelligence	1
Aviation	1
Bridge construction	4
Business	4
China	1
Computer networks	1
Computers	3
Corporate governance	1
Cryptography	2
Earth sciences	1
Electronics	17
Finances	1
General	10
Geophysics	1
Information technology	14
Mathematics	4
Metallurgy	3
Oil / petroleum	2
Space	4
Technology	53
Telecommunications	2