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Q.598 : सुब्मरिन के अविष्कारक कौन थे ?
(a) ग मार्कोनी
(b) डब्ल्यू ले बारोनजेन्नी
(c) वॉल्टर हंट
(d) लाएन्नई(Laennec)
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Answer :
लाएन्नई(Laennec)
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