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信号载波 : 46 phrases in 12 subjects |
| Air defense | 5 |
| Communications | 1 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 10 |
| Information technology | 1 |
| Project management | 1 |
| Rail transport | 1 |
| Shipbuilding | 2 |
| Space | 2 |
| Technology | 16 |
| Telecommunications | 5 |
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