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in সাধারণ by Earnings: 0.024 Usd (24 points)

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নির্দিষ্ট দিকে তরঙ্গ এক সেকেন্ডে যে দূরত্ব অতিক্রম করে তাকে তরঙ্গ বেগ বলে ।
by Earnings : 7.67 Usd (6,726 points)

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