वायु का लगभग कितना भाग ऑक्� – McqOptions

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1.	वायु का लगभग कितना भाग ऑक्सीजन है -
A.	1 ः 5
B.	1 ः 4
C.	2 ः 3
D.	2 ः 5
Answer» B. 1 ः 4

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