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| DC system; direct-current system | |||
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直流电系统 : 19 phrases in 7 subjects |
| Aviation | 1 |
| Electric machinery | 2 |
| Electronics | 3 |
| Metallurgy | 1 |
| Nuclear and fusion power | 4 |
| Shipbuilding | 1 |
| Technology | 7 |
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