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উড়োজাহাজের গতি নির্নয়ক যন্ত্র কোনটি?

  1. A ক্রোনোমিটার(chronometer)
  2. B ট্যাকোমিটার(tachometer)
  3. C ট্যাক্সিমিটার(taximeter)
  4. D পিডোমিটার(pedometer)
Answer: B - ট্যাকোমিটার(tachometer)

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