সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন
Which of the following has an organic origin?
Which of the following has an organic origin?
- ক. sand
- খ. bakelite
- গ. coal
- ঘ. nylon
সঠিক উত্তরঃ coal
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Basic Information of Daily Science, Inventions and...