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频率机动 : 16 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 2 |
| Electric machinery | 1 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 2 |
| Radio | 1 |
| Shipbuilding | 2 |
| Space | 2 |
| Technology | 2 |
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