engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Engineering Materials Science Heat Treatment Process Case Hardening

इनमें से कौन सी सतह कठोरीकरण प्रक्रिया है?

1

कार्बुरण

2

नाइट्राइडीकरण

3

साइनाइडीकरण

4

ये सभी

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