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| 离心浇制混凝土管; 旋制混凝土管; 离心旋转制造混凝土; 离心浇注混凝土管 | |||
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spun concrete pipe : 15 phrases in 5 subjects |
| Bridge construction | 1 |
| Engineering geology | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 11 |
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