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| твёрдые горные породы; твёрдая порода | |||
| скальные породы; крепкая порода | |||
| 坚硬岩石: 8 phrases in 5 subjects |
| Drilling | 2 |
| General | 1 |
| Geology | 2 |
| Mining | 1 |
| Technology | 2 |
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