railway RRB JE (CBT I + CBT II) Mock Test 2024 Estimation and Costing Estimation of Wiring

रूफ स्लैब में प्रयुक्त जंक्शन बॉक्स की न्यूनतम गहराई _______ होगी।

1
65 mm
2
60 mm
3
70 mm
4
75 mm
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