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प्रश्न
______ refers to the organic matter which settles down after physical treatment of sewage.
विकल्प
Primary sludge
Particulate matter
Digested sludge
Activated sludge
MCQ
रिक्त स्थान भरें
उत्तर
Primary sludge refers to the organic matter which settles down after physical treatment of sewage.
shaalaa.com
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