state gov RSMSSB Grade 4 (Group D) Mock Test Series 2025 Refrigeration and Air Conditioning Refrigerants Designation of Refrigerants

R717 का रासायनिक सूत्र क्या है?

1
N2
2
NH3
3
H2O
4
CO2
5
अनुत्तरित प्रश्न
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