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| 二股流 | |||
| 二次风 | |||
| 二次空气 | |||
| 二次风延燃空气 | |||
| 次级空气 | |||
| 助燃空气; 二次进风; 补充空气 | |||
| 二次气流 | |||
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| 二次空气 | |||
| secondary air: 55 phrases in 9 subjects |
| Automobiles | 29 |
| Aviation | 2 |
| Ecology | 2 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 7 |
| Nautical | 1 |
| Refrigeration | 2 |
| Technology | 10 |
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