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| твёрдая порода (硬岩石) | |||
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硬岩 : 50 phrases in 10 subjects |
| Chemistry | 1 |
| Construction | 2 |
| Drilling | 4 |
| Electronics | 4 |
| Forestry | 1 |
| General | 7 |
| Geology | 17 |
| Mining | 2 |
| Oil / petroleum | 2 |
| Technology | 10 |
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