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உயிரியல் ஆக்ஸிஜன் தேவை என்பது நீரில் ———————- க்குத் தேவைப்படும் கரைந்த ஆக்ஸிஜனின் அளவு ஆகும். Biological Oxygen Demand is the amount of dissolved oxygen required by ——————— in water.
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