Computer · Building Materials
एक अच्छी ईंट की कठोरता का परीक्षण किसके द्वारा किया जाता है?
- 1लोहे की कील से खरोंचकर✓
- 2अम्ल में डुबोकर
- 3हथौड़े से मारकर
- 4समान भार लगाकर
सही उत्तर देखें
लोहे की कील से खरोंचकर
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