engineering recuitment BEL Probationary Engineers Mock Test 2025 Refrigeration and Air Conditioning Refrigerants

जल प्रशीतक अनुप्रयोग के लिए VCRS चक्र में उपयोग किया जाने वाला प्रशीतक ________है।

1

R22

2

R21

3

R717

4

R134a

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