railway RRB JE (CBT I + CBT II) Mock Test 2024 Construction Materials and Management Building Component Super Structure
What does 10 DS 20 means
1
990 mm wide door with single shutter of height 1990 mm
2
1000 mm wide door with single shutter of height 2000 mm
3
990 mm wide door with double shutter of height 1990 mm
4
1000 mm wide door with double shutter of height 2000 mm