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| 空心混凝土; 钻取的混凝土圆柱体试件; 核心混凝土螺旋筋内侧的混凝 | |||
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core concrete : 33 phrases in 5 subjects |
| Architecture | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 4 |
| Technology | 26 |
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