माइक्रोफोन का आविष्कारक क� – McqOptions

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1.	माइक्रोफोन का आविष्कारक किसे माना जाता है?
A.	स्टीफन हाकिंग
B.	डा. जोइल एन्जेल
C.	डा. केविन कार्मोन
D.	ग्राहम बेल
Answer» E.

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