engineering recuitment NCL Assistant Foreman (Trainee) Mock Test 2024 Refrigeration and Air Conditioning Refrigerants Designation of Refrigerants

प्रशीतक R–717 क्या है?

1
वायु 
2
अमोनिया 
3
कार्बन डाइऑक्साइड 
4
फ़्रेयॉन -12 
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