সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
What are the main constituents of biogas?
What are the main constituents of biogas?
- ক. butane and carbon-dioxide
- খ. methane and carbon-monoxide
- গ. methane and carbon-dioxide
- ঘ. ethylene and carbon-dioxide
সঠিক উত্তরঃ methane and carbon-dioxide
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