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| 环频数 | |||
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loop frequency : 28 phrases in 9 subjects |
| Air defense | 5 |
| Automatic control | 1 |
| Aviation | 2 |
| Communications | 3 |
| Electronics | 8 |
| Otorhinolaryngology | 2 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 4 |
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