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| air duct system | |||
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风管 系统 : 43 phrases in 10 subjects |
| Architecture | 1 |
| Earth sciences | 1 |
| Finances | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 7 |
| Nautical | 3 |
| Project management | 1 |
| Rail transport | 1 |
| Refrigeration | 10 |
| Technology | 17 |
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