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| 管道内底高程 (管道内壁最低点的高程) | |||
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| 管内底标高 | |||
| 底板高程 | |||
| 地下管道内底高程; 负高程; 管道内径底点高程; 仰拱高程; 堰顶高程; 闸槛高程; 闸底板高程; 管内底标高 (程); 管道内底高程; 渠槽底坡管道内底高程; 底拱高程 | |||
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inverted elevation : 2 phrases in 1 subject |
| Technology | 2 |
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