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| 底部钻具组合 | |||
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bottom assembly : 40 phrases in 9 subjects |
| Automobiles | 1 |
| Drilling | 21 |
| Earth sciences | 4 |
| Electronics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 6 |
| Rail transport | 1 |
| Technology | 2 |
| Textile industry | 1 |
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