NimnLikhit Me Se Kaunsa Dhwani Paravartak Padarth Hai ? निम्नलिखित में से कौनसा ध्वनि परावर्तक पदार्थ है ?

निम्नलिखित में से कौनसा ध्वनि परावर्तक पदार्थ है ?

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