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

साधारण अवसादन के माध्यम से हटाए जाने वाले जीवाणु भार का प्रतिशत लगभग कितना होता है?

1
25
2
50
3
75
4
85
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