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循环码 : 58 phrases in 14 subjects |
Automobiles | 4 |
Aviation | 1 |
Business | 2 |
Communications | 1 |
Computers | 3 |
Cryptography | 3 |
Electronics | 5 |
General | 1 |
Information technology | 8 |
Mathematics | 2 |
Project management | 1 |
Space | 9 |
Technology | 13 |
Telecommunications | 5 |