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

धातु का हिस्सा कैसा दिखता है, अगर यह ऑक्सीकृत हो जाता है?

1
जीर्णशीर्ण
2
जंग लगा हुआ 
3
घर्षण किया हुआ 
4
घिसा हुआ 
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