विल्हेल्म रॉन्टजेन ने आवि� – McqOptions

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1.	विल्हेल्म रॉन्टजेन ने आविष्कार कौन थे ?
A.	विद्वुत मीटर का
B.	एक्स-रे मशीन का
C.	रेडियो का
D.	विद्वुत बल्ब का
Answer» C. रेडियो का

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