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| 预应力混凝土管 | |||
| 预应力钢筋混凝土管 | |||
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| 预应力钢筋混凝土管 | |||
| prestressed concrete pipe: 21 phrases in 4 subjects |
| Bridge construction | 1 |
| Earth sciences | 1 |
| Rail transport | 1 |
| Technology | 18 |
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