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频率调整 : 17 phrases in 9 subjects |
| Air defense | 2 |
| Business | 2 |
| Electric machinery | 1 |
| Electronics | 1 |
| General | 2 |
| Piezoelectric crystals | 2 |
| Shipbuilding | 3 |
| Space | 3 |
| Technology | 1 |
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