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微调频率 : 18 phrases in 9 subjects |
| Air defense | 1 |
| Communications | 4 |
| Earth sciences | 1 |
| General | 1 |
| Oil / petroleum | 2 |
| Radio | 1 |
| Shipbuilding | 1 |
| Technology | 1 |
| Telecommunications | 6 |
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