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एक्स-रे का आविष्कार किसने किया था ?
1.
एक्स-रे का आविष्कार किसने किया था ?
A.
हॉपकिन्स
B.
रॉन्टजन
C.
मार्कोनी
D.
मोर्स
Answer» C. मार्कोनी
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