railway RRB Junior Stenographer (Ministerial and Isolated Categories) Mock Test General Science Biology Human body

ब्लू बेबी सिंड्रोम ______च्या अतिप्रमाणामुळे होतो.

1
कार्बन डायऑक्साईड 
2
लोखंड 
3
नायट्रेट 
4
कार्बन मोनॉक्साईड 
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