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频谱计 : 24 phrases in 9 subjects |
| Air defense | 3 |
| Chemistry | 1 |
| Electronics | 5 |
| General | 1 |
| Metallurgy | 1 |
| Otorhinolaryngology | 2 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 9 |
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