General Science · Coal Classification
पीट कोयले में कार्बन की मात्रा लगभग कितने प्रतिशत होती है?
- 190% से अधिक
- 280-85%
- 365-70%
- 450-60% से कम✓
सही उत्तर देखें
50-60% से कम
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