Physics · Environmental Physics
IS 10500-2012 के अनुसार, वैकल्पिक स्रोत की अनुपस्थिति में पीने के पानी में CaCO3 (mg/l में) के रूप में कुल कठोरता की अधिकतम अनुमेय सीमा क्या है?
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