engineering recuitment WBPSC JE Civil Mock Test 2022 Environmental Engineering Water Treatment

सामान्य मंद रेत फिल्टर के लिए जल निस्यंदन दर की सही सीमा क्या है?

1
24-48 Ml/d/ha
2
240-480 Ml/d/ha
3
10-20 Ml/d/ha
4
700-1400 Ml/d/ha
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