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调 速 变频 : 23 phrases in 9 subjects |
| Electric machinery | 8 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 2 |
| Rail transport | 2 |
| Shipbuilding | 2 |
| Technology | 3 |
| Wind Energy | 1 |
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