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| 孕镶金冈石 | |||
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diamond impregnated : 25 phrases in 7 subjects |
| Drilling | 2 |
| Engineering geology | 1 |
| General | 1 |
| Mechanics | 1 |
| Metallurgy | 11 |
| Oil / petroleum | 1 |
| Technology | 8 |
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