Digital telephone system starts at Bangladesh at first in--

বাংলাদেশ বিষয়াবলি
National and Special Concern

প্রশ্নঃ Digital telephone system starts at Bangladesh at first in--

  • ক. 17 April 1971
  • খ. 4 January 1990
  • গ. 1 December 1980
  • ঘ. 26 March 1972

সঠিক উত্তরঃ

4 January 1990
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