railway DFCCIL Executive 2025 Mock Test Draftsman Basic Engineering Drawing Drawing Instruments

B.I.S. के अनुसार B1 ड्रॉइंग बोर्ड का साइज होता है-

1
1000 × 1500 × 25 mm
2
1000 × 700 × 25 mm
3
700 x 500 x 15 mm
4
500 x 350 x 15 mm
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