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| double current method; polar direct-current system | |||
| 双流制: 17 phrases in 8 subjects |
| Automobiles | 1 |
| Chemistry | 1 |
| Electronics | 6 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Refrigeration | 1 |
| Technology | 4 |
| Telecommunications | 2 |
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