engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Bearing

बॉल बेअरिंग्सच्या रेस बनवण्यासाठी कोणती सामग्री वापरली जाते?

1
पितळ
2
क्रोमियम पोलाद 
3
बीड 
4
प्लास्टिक
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