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| 混凝土工程 | |||
| 混凝土工厂 | |||
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| 混凝土作业 | |||
| 混凝土工程 | |||
| concrete works: 36 phrases in 5 subjects |
| Electronics | 1 |
| Engineering geology | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Technology | 30 |
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