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| обрушение; система разработки с обрушением; система с обрушением | |||
| способ разработки с обрушением | |||
| 崩落采矿法: 41 phrases in 5 subjects |
| General | 25 |
| Geology | 1 |
| Mineralogy | 5 |
| Mining | 5 |
| Technology | 5 |
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