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Q.630 : राडार का अविष्कार किसने किया ?
(a) लिब्बी
(b) टेलर और लियो सी योंग
(c) मोहलों लूमीएस
(d) जोसेफ स्वॅन
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Answer :
टेलर और लियो सी योंग
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