engineering recuitment NMDC Junior Officer (Trainee) Mock Test 2024 Refrigeration and Air Conditioning Refrigerants Designation of Refrigerants

निम्नलिखित में से कौन-सा शीतलक CCl3F का सही नाम है?

1
R 12
2
R 21
3
R 11
4
R 22 
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