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| 下沉速度 | |||
| 沉降速度 | |||
| 沉陷速度; 沉下速度; 沉速; 下钻杆速度; 下井筒速度 | |||
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sinking velocity : 2 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 1 |
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