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二氧化碳含量 : 9 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Metallurgy | 1 |
| Nursing | 1 |
| Refrigeration | 1 |
| Shipbuilding | 1 |
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