সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
Among the following which is the purest form of iron?
Among the following which is the purest form of iron?
- ক. grey cast iron
- খ. wrought iron
- গ. steel
- ঘ. white cast iron
সঠিক উত্তরঃ wrought iron
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Basic Information of Daily Science, Inventions and...