engineering recuitment NMDC Maintenance Assistant Fitter 2021 Mock Test Engineering Materials Science Heat Treatment Process Case Hardening

नाइट्राइडीकरण में ______ का उपयोग किया जाता है।

1
जल स्नान
2
मीथेन
3
स्लेट स्नान
4
अमोनिया
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