railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Joining Soldering and Brazing

_________और ____________सोल्डरन मिश्रधातु के मुख्य घटक हैं। 

1
सीसा; मैग्नीशियम 
2
तांबा; टिन
3
सीसा; तांबा
4
टिन; सीसा 
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