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| 面积系数 | |||
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| 面积系数 | |||
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area-coefficient : 18 phrases in 7 subjects |
| Bridge construction | 3 |
| Compressors | 1 |
| Hydroelectric power stations | 1 |
| Nautical | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 10 |
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