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| 工作面顶板控制采煤工作面中工作空间支护和采空区处理的总称 | |||
| 顶板控制; 顶板管理; 地压控制 | |||
| roof control: 8 phrases in 3 subjects |
| Automobiles | 1 |
| Metallurgy | 3 |
| Technology | 4 |
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