engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Refrigeration and Air Conditioning Refrigerants

हवाई जहाज में इस्तेमाल होने वाला प्रशीतन _____ है। 

1
CO2
2
फेरोन -11
3
वायु
4
फेरोन -22
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