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| 供应管道; 送风道 | |||
| supply duct: 22 phrases in 8 subjects |
| Architecture | 2 |
| Aviation | 2 |
| Compressors | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Refrigeration | 5 |
| Space | 1 |
| Technology | 8 |
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