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speed control by frequency variation |
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 |