Computer · Building Materials
अच्छी ईंट बनाने वाली मिट्टी (brick earth) में एल्युमिना का मानक प्रतिशत कितना होता है?
- 120 से 30 प्रतिशत✓
- 21 प्रतिशत से कम
- 350 से 60 प्रतिशत
- 410 प्रतिशत
सही उत्तर देखें
20 से 30 प्रतिशत
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