railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Water Supply Distribution of Water

इमारतों में पानी की आपूर्ति के लिए कार्यप्रणाली का IS-कोड क्या है?

1

IS: 1172–1993

2

IS: 2065–1983

3

IS: 800–2007

4

IS: 383–1970

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