engineering recuitment FCI JE 2022 Mock Test for CE/ME/EE (Phase I & II) General Science Chemistry Chemistry in Everyday Life

आर्क-वेल्डिंगमध्ये खालीलपैकी कोणता वायू वापरला जातो?

1
हेलिअम 
2
निऑन 
3
ऑक्सिजन 
4
रेडॉन 
5
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