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| 离心钢筋混凝土管 | |||
| 离心浇注钢筋混凝土管; 离心法制钢筋混凝土管; 休谟管; 离心钢筋混凝上管 | |||
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centrifugal reinforced concrete pipe : 1 phrase in 1 subject |
| Bridge construction | 1 |
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