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| 调压控制 | |||
| 变压调节速; 可变电压控制 | |||
| 变压控制 | |||
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| 以变动电压进行控制; 可变电压控制 | |||
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variable voltage control : 2 phrases in 2 subjects |
| Rail transport | 1 |
| Technology | 1 |
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