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通信信件
econ.
correspondence
通信信件:
91 phrases
in 18 subjects
Air defense
4
Artificial intelligence
1
Aviation
10
Computer networks
1
Cryptography
5
Electronics
24
Environment
1
General
4
Hydroelectric power stations
1
Information technology
7
Metallurgy
2
Multimedia
2
Nautical
1
Project management
4
Space
8
Technology
4
Telecommunications
11
United Nations
1
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