engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test Fitter Joining Brazing and Soldering

सोल्डर लोहे के लिए उपयुक्त पदार्थ कौन-सा है?

1
मैग्नीशियम
2
कॉपर
3
टिन
4
लोहा
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