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| 表层套管 | |||
| 地面管线; 明管; 地面水管 | |||
| 表面缩孔 | |||
| 地表管 | |||
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surface pipe : 13 phrases in 6 subjects |
| Earth sciences | 1 |
| Hydraulics | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Shipbuilding | 1 |
| Technology | 5 |
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