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| 混凝土空心砌块砖 | |||
| 混凝土空心块 | |||
| 混凝土空心砖; 混凝土空心砌块 | |||
| 空心混凝土块; 混凝土空心方块; 混凝土空气砖 | |||
| concrete hollow block: 21 phrases in 3 subjects |
| Project management | 1 |
| Rail transport | 1 |
| Technology | 19 |
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