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| 变换电压: 50 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Electric machinery | 2 |
| Electronics | 16 |
| General | 2 |
| Geophysics | 2 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Solar power | 2 |
| Space | 1 |
| Technology | 17 |
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