Computer · Environmental Engineering
ऑक्सीकरण तालाबों (oxidation ponds) के लिए निरोध अवधि (detention period) आमतौर पर कितनी रखी जाती है?
- 115 to 20 दिन
- 210 से 15 दिन✓
- 38 से 10 दिन
- 44 से 8 दिन
सही उत्तर देखें
10 से 15 दिन
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