engineering recuitment ISRO Technical Assistant 2024 Mock Test Internal Combustion Engine Fuels and Combustion

बिटुमिनस कोयले में कार्बन का प्रतिशत किस क्रम में होता है?

1
20 – 40%
2
30 – 50%
3
50 – 60%
4
60 – 85%
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