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声频仪 : 23 phrases in 10 subjects |
| Air defense | 1 |
| Automobiles | 2 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 3 |
| Electronics | 4 |
| Geophysics | 2 |
| Shipbuilding | 3 |
| Space | 1 |
| Technology | 5 |
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