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| 无级均匀调节; 无级调整 | |||
| 平滑调整 | |||
| 平滑调节; 无级调节; 不分挡调节 | |||
| stepless regulation: 4 phrases in 4 subjects |
| Communications | 1 |
| Drilling | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |
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