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‏وقتی هلیکوپترها در صحرا پرواز می‌کنند، پره‌هایشان براثر برخورد و اصطکاک با ذرات ریز ماسه معلق در هوا جرقه می‌زنند. این پدیده باعث فرسایشِ لبه‌های ملخ‌ها می‌شود.
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‏وقتی هلیکوپترها در صحرا پرواز می‌کنند، پره‌هایشان براثر برخورد و اصطکاک با ذرات ریز ماسه معلق در هوا جرقه می‌زنند. این پدیده باعث فرسایشِ لبه‌های ملخ‌ها می‌شود.
🚁@NIT_Aerospace

BY انجمن علمی مهندسی هوافضا






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The regulator said it has been undertaking several campaigns to educate the investors to be vigilant while taking investment decisions based on stock tips. False news often spreads via public groups, or chats, with potentially fatal effects. Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. Recently, Durav wrote on his Telegram channel that users' right to privacy, in light of the war in Ukraine, is "sacred, now more than ever." These entities are reportedly operating nine Telegram channels with more than five million subscribers to whom they were making recommendations on selected listed scrips. Such recommendations induced the investors to deal in the said scrips, thereby creating artificial volume and price rise.
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