engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Joining Welding

प्रतिरोध वेल्डन में दोनों इलेक्ट्रोड किसके बने होते हैं?

1
एल्यूमिनियम
2
तांबा
3
लोहा
4
कांस्य
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