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排出的气 : 18 phrases in 9 subjects |
| Automobiles | 1 |
| Construction | 1 |
| Electronics | 3 |
| Environment | 1 |
| General | 2 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Technology | 7 |
| Thermal engineering | 1 |
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