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  3. 7th Class
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  5. Wastewater Story

7th Class Science Wastewater Story Question Bank Wastewater Story

  • question_answer
    By product of water treatment are

    A) Sludge             

    B) Biogas

    C) Sludge & Biogas         

    D) None of these

    Correct Answer: C

    Solution :

    Sludge & Biogas


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