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| 钻孔套管 | |||
| 凿岩机外壳 | |||
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drill casing : 11 phrases in 6 subjects |
| Drilling | 1 |
| Earth sciences | 1 |
| International trade | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 6 |
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