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整流变 压 器 : 20 phrases in 9 subjects |
| Aviation | 7 |
| Drilling | 1 |
| Electric machinery | 2 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 4 |
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