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| твёрдая порода (硬岩) | |||
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硬岩石 : 30 phrases in 7 subjects |
| Drilling | 4 |
| Electronics | 4 |
| General | 5 |
| Geology | 10 |
| Mining | 2 |
| Oil / petroleum | 2 |
| Technology | 3 |
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