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| 〔钻探管材〕内外加厚 | |||
| 内外加厚的 | |||
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| 内外加厚 | |||
| internal external upset: 8 phrases in 4 subjects |
| Drilling | 3 |
| Earth sciences | 1 |
| Oil / petroleum | 3 |
| Technology | 1 |
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