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

सौम्य पोलादाचे _____ प्रक्रियेद्वारे कवच कठिणीकरण  केले जाते. 

1
प्रसामान्यीकरण
2
कठिणीकरण
3
अनुशीतन
4
नत्रीकरण
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