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运营系统 : 42 phrases in 11 subjects |
| Advertising | 1 |
| Aviation | 2 |
| Communications | 5 |
| Economy | 1 |
| Electronics | 20 |
| Information technology | 3 |
| Project management | 1 |
| Rail transport | 2 |
| Space | 2 |
| Technology | 3 |
| Telecommunications | 2 |
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