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碳- 氮 -氧 : 11 phrases in 8 subjects |
| Automobiles | 2 |
| Earth sciences | 2 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 1 |
| Oil processing plants | 1 |
| Space | 1 |
| Technology | 2 |
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