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| 逆衬砌法 (隧道施工时用的方法) | |||
| 逆衬砌法 | |||
| 隧道的逆衬砌先做顶部衬砌,后做侧壁衬砌 | |||
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inverted lining : 1 phrase in 1 subject |
| Technology | 1 |
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