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双谐振 振荡器 : 30 phrases in 14 subjects |
| Air defense | 4 |
| Automobiles | 1 |
| Aviation | 1 |
| Computer numerical control | 1 |
| Construction | 1 |
| Electronics | 5 |
| General | 4 |
| Geophysics | 1 |
| Information technology | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 5 |
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