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Date: 21-5-2019
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Date: 26-1-2017
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Date: 24-4-2019
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In network solids, conventional chemical bonds hold the chemical subunits together. The bonding between chemical subunits, however, is identical to that within the subunits, resulting in a continuous network of chemical bonds. One common examples of network solids are diamond (a form of pure carbon) Carbon exists as a pure element at room temperature in three different forms: graphite (the most stable form), diamond, and fullerene.
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إدارة الغذاء والدواء الأميركية تقرّ عقارا جديدا للألزهايمر
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شراء وقود الطائرات المستدام.. "الدفع" من جيب المسافر
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بمشاركة 23 دولة عربية واجنبية ...قارئ العتبة العسكرية المقدسة يحصل على المركز الخامس في مسابقة كربلاء الدولية بنسختها الثالثة
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