railway RRB JE (CBT I + CBT II) Mock Test 2024 Basic Science and Engineering Engineering Drawing

केंद्र रेखाएँ, खंड रेखाएँ _____ पेंसिल का उपयाग करके खींची जाती है।

1
H
2
2H
3
3H या 4H
4
HB
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