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调制频带 : 13 phrases in 10 subjects |
| Aviation | 2 |
| Communications | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Radio | 2 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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