engineering recuitment NMDC Junior Officer (Trainee) Mock Test 2024 General Knowledge Ecology and Environment

गोबर गैस का मुख्य घटक क्या है?

1
कार्बन मोनोक्साइड
2
मीथेन
3
हाइड्रोजन
4
दोनों 1) और 2)
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