engineering recuitment NHPC JE & THDC JE 2023 Mock Test Environmental Engineering Quality of Water

डब्ल्यूएचओ के अनुसार, पीने के पानी में अनुमेय क्लोराइड सामग्री कितनी है?

1
0.001 mg/1
2
1 mg/1
3
200 mg/1
4
350 mg/1
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