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

सीढ़ी की ढाल किससे अधिक नहीं होनी चाहिए?

1
18 डिग्री
2
25 डिग्री
3
20 डिग्री
4
45 डिग्री
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