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| |||
| 床面粗糙度 | |||
| 河床糙率 | |||
| 河床粗糙度 | |||
| 沟床糙度 | |||
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bed roughness : 6 phrases in 4 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Technology | 2 |
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