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调谐频率 : 28 phrases in 12 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Construction | 1 |
| Electric machinery | 2 |
| Electronics | 10 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Otorhinolaryngology | 1 |
| Space | 2 |
| Technology | 4 |
| Wind Energy | 1 |
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