সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
When we breathe which of the following gases do we use?
When we breathe which of the following gases do we use?
- ক. carbon dioxide
- খ. hydrogen
- গ. oxygen
- ঘ. helium
সঠিক উত্তরঃ oxygen
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Basic Information of Daily Science, Inventions and...