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| negative skin friction; negative friction | |||
| downward drag; dragdown | |||
| negative mantle friction (桩工); negative skin friction (桩工) | |||
| |||
| negative skin friction | |||
| 负摩擦力: 9 phrases in 3 subjects |
| Engineering geology | 3 |
| Oil / petroleum | 1 |
| Technology | 5 |
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