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| effective frequency | |||
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有效频率 : 8 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Otorhinolaryngology | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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