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| oxygen хим. balance | |||
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| oxygen balance | |||
| oxygen equilibrium | |||
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| oxygen balance | |||
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氧平 衡 : 51 phrases in 9 subjects |
| Agriculture | 3 |
| Automobiles | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Ecology | 3 |
| Explosives and Explosive Ordnance Disposal | 6 |
| Metallurgy | 17 |
| Technology | 17 |
| Water resources | 2 |
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