engineering recuitment HPCL Junior Executive 2025 Mock Test Refrigeration and Air Conditioning Refrigerants Designation of Refrigerants

 प्रशीतक R – 134 में _________ कार्बन परमाणु मौजूद होता/होते है/हैं। 

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एक
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दो 
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तीन 

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शून्य
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