engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Basic Science and Engineering Engineering Drawing

आरेखण के लिए सामान्यतौर पर पेंसिल की किस श्रेणी का प्रयोग किया जाता है?

1
HB
2
2H
3
5B
4
5H
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