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| combination drill | |||
| 组合钻: 126 phrases in 9 subjects |
| Automobiles | 2 |
| Business | 1 |
| Drilling | 58 |
| Earth sciences | 2 |
| Engineering geology | 1 |
| Mechanics | 2 |
| Oil / petroleum | 40 |
| Securities | 1 |
| Technology | 19 |
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