engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test Fitter Machining Lapping and Honning

लैपिंग के लिए कौन सी धातु उपयुक्त नहीं है?

1
तांबा
2
टंगस्टन
3
लेड
4
पीतल
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