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रासायनिक ऑक्सीजन माँग Chemical Oxygen Demand Quick & Easy to understand video lecture in Hindi
Chemical Oxygen Demand : जल में कार्बनिक व अकार्बनिका यौगिकों के ऑक्सीकरण के लिये आवश्यक ऑक्सीजन की मात्रा। अनुप्रयोगों - रासायनिक ऑक्सीजन माँग : प्रदूषण के ...
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