Environment & Ecology · Environment
पेयजल में फ्लोराइड की अनुमत की अनुमत सीमा क्या है?
- 13.5 मिलीग्राम/लीटर
- 22.5 मिलीग्राम/लीटर
- 31.5 मिलीग्राम/लीटर✓
- 40.5 मिलीग्राम/लीटर
सही उत्तर देखें
1.5 मिलीग्राम/लीटर
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