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| biochemical oxygen demand | |||
| biological oxygen demand | |||
| biologic oxygen demand | |||
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生物需氧量 : 32 phrases in 8 subjects |
| Desert science | 1 |
| Earth sciences | 4 |
| Ecology | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Reproductive biology | 1 |
| Technology | 20 |
| Water resources | 3 |
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