engineering recuitment MP ITI Training Officer Mock Test 2024 Fitter Heat Treatment

सायनाइडिंग तथा नाईट्राइडिंग ___________ के दो प्रकार हैं 

1
कठोरन
2
केस कठोरन
3
मृदुकरण (टेंपरिंग)
4
प्रसामान्यीकरण
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