In 2015, aircraft maker Boeing de-veloped a metal called ............. which is lighter than air and stronger than steel.

  • 1

    टाइटेनियम

  • 2

    मॉलिब्डेनम

  • 3

    माइक्रोलैटिस

  • 4

    इरिडीयम

Answer:- 3

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