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| heating and ventilation | |||
| heating and ventilating | |||
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采 暖 通风 : 20 phrases in 10 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| General | 3 |
| Nautical | 1 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Project management | 2 |
| Rail transport | 1 |
| Technology | 7 |
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