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498 . কম্পিউটারের মাউস আবিষ্কার করেন—

  • A. ডগলাস এঞ্জেলবার্ট, ১৯৬৪ সালে
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503 . প্রাইমারি দূষক —

  • A. SO2, NO, NO, CO, CO, ইত্যাদি
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508 . লিনাক্স অপারেটিং সিস্টেমকে বলা হয়— 

  • A. ওপেন সোর্স অপারেটিং সিস্টেম
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