Sewage System MCQ App Download | Class 7 Science PDF e-Book
Class 7 Science Practice Test: MCQs for Exam Prep
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The soil and sand is settled at the bottom in
Untreated sewage should not be pumped into
In country area, untreated sewage is pumped into tanks known as
The remaining sewage after it has passed through the sludge tank is known as
Which gas is often used as a energy source at the city's wastewater treatment plants?
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