engineering recuitment HPCL Engineer Mock Test 2024 Environmental Engineering Quality of Water

IS 10500 : 2012 के अनुसार पीने के जल में कैल्शियम की वांछनीय सीमा क्या है?

1
20 mg/l
2
50 mg/l
3
75 mg/l
4
100 mg/l
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