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| 丘筒井壁; 筒壁支架 | |||
| 丘宾筒井壁; 弧瓦衬砌; 加固铁管; 铁管支架 | |||
| тюбинговая крепь: 3 phrases in 2 subjects |
| Mining | 2 |
| Technology | 1 |
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