engineering recuitment BPSC Assistant Sanitary & Waste Management Officer Mock Test 2022 Environmental Engineering Solid Waste Management

कुएं या हैंडपंप से प्रिवी पिट का पता लगाने के लिए न्यूनतम क्षैतिज दूरी क्या है?

1
30 m
2
50 m
3
100 m
4
70 m
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