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air duct design
| principles and considerations
| air duct design | |
| shipb. | 风管设计 |
| principle and consideration | |
| refrig. | 原则和注意事项 |
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| 风管设计 | |||
| 风道设计 | |||
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air duct design : 2 phrases in 1 subject |
| Refrigeration | 2 |
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