engineering recuitment BPSC Assistant Sanitary & Waste Management Officer Mock Test 2022 Environmental Engineering Water Treatment

प्राथमिक अपशिष्ट जल उपचार किसका उद्देश्य है?

1
स्थायीकरण 
2
निस्यंदन 
3
स्कंदक 
4
अवसादन
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