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脉 振 器 : 65 phrases in 11 subjects |
| Air defense | 7 |
| Chemistry | 1 |
| Earth sciences | 5 |
| Electronics | 10 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Shipbuilding | 2 |
| Space | 2 |
| Technology | 31 |
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