railway RRB JE (CBT I + CBT II) Mock Test 2024 Draftsman Floor and Roof Types of Roofs

ईंट कंक्रीट छत में कड़ी की केंद्र-से-केंद्र दूरी क्या होती है?

1
30 cm
2
45 cm
3
60 cm
4
75 cm
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