Скачать или смотреть हवा में मौजूद ऑक्सीजन और ऑक्सीजन सिलेंडर में अंतर//oxygen vs medical oxygen

Hey Dosto,
App Sab ko to pata hoga ki oxygen ham sab ke liye kitni important hai, to phir in dino oxygen ki kami kyu hone lagi , jabki hamare charo taraf oxygen hai, aur ajj apko janne ko milega is video mein oxygen aur medical mein difference kya hai?? Isliye is video ko last tak dekhna na bhule.


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