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直流型 : 34 phrases in 10 subjects |
| Agriculture | 12 |
| Animal husbandry | 1 |
| Aviation | 1 |
| Earth sciences | 2 |
| Electric machinery | 5 |
| General | 2 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Plastics | 1 |
| Technology | 7 |
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