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

गैस वेल्डन में सामान्यतौर पर कौन-से ईंधन गैस का प्रयोग किया जाता है?

1
N2
2
CO2
3
C2H2
4
He
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