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| 反并联连接法; 双换流器 | |||
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double converter : 9 phrases in 7 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
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