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Date: 6-11-2018
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Date: 26-12-2018
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Despite how light it is for a metal, beryllium has a very high melting point. It also has a high modulus of elasticity that is 50% greater than steel, along with a low density giving it a fast sound conduction speed. At STP, beryllium resists oxidation and resists corrosion in the air.
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لصحة القلب والأمعاء.. 8 أطعمة لا غنى عنها
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حل سحري لخلايا البيروفسكايت الشمسية.. يرفع كفاءتها إلى 26%
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قسم الحزام الأخضر الجنوبي ينظّم حفلاً بذكرى ولادة الإمام علي (عليه السلام)
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