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| 围岩分类 | |||
| 围岩分级 | |||
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surrounding rock classification : 6 phrases in 5 subjects |
| Bridge construction | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Rail transport | 1 |
| Technology | 2 |
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