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

फ्रेऑन - 12 का रासायनिक सूत्र क्या है?

1
CHClF2
2
CH3Cl
3
CCl2F2
4
इनमें से कोई भी नहीं
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