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Keep going قاعدة ارخميدس 20 نوفمبر 2013

عندما تكون درجة الحرارة باردة بدرجة كافية يتحول الماء السائل إلى جليد صلب، إن الماء يتمدد كثيراً عند التجمد حيث إن عشرة لترات من الماء تع...

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