Computer · Water Supply Engineering
सुरक्षित पेयजल की जैव रासायनिक ऑक्सीजन मांग (B.O.D.) कितनी होनी चाहिए?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 115 ppm
- 210 ppm
- 35 ppm
- 4शून्य (Nil)✓
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