railway RRB JE (CBT I + CBT II) Mock Test 2024 Construction Materials and Management Building Component

आवासीय भवनों के लिए सोपानाग्र पटरी की न्यूनतम चौड़ाई __________ होगी।

1
150 mm
2
350 mm
3
250 mm
4
450 mm
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