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| 凯氏方钻杆 | |||
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| 方钻杆 | |||
| 方形钻杆; 凯利方钻杆 | |||
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Kelly bar : 8 phrases in 4 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |
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