General Science Parashravy Tarangein Manushyo Dwara . . . . . . . . .

Q.10460: पराश्रव्य तरंगें मनुष्यो द्वारा . . . . . . . . .
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कृपया शेयर करें=>


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Anonymous on 01-01-1900

20000hz ke upr ki tarange hoti h but ye to 20000hz ke niche h


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