خصائص الوسط اللى بيتنقل فيه الصوت. اتفرج علي الفيديو و اعرف ايه هي خصائص انتقال الصوت و ليه الصوت مش بيتنقل في الفضاء؟ و ذلك من خلال تجربة فى كتاب العلوم لسنة تانية إعدادي بتشرحلنا ده.
Amr Allam assumed his role as Group Co-Chief Executive Officer for Hassan Allam Holding in 2010. He spearheaded the dynamic evolution of the Group’s corporate strategy and expansion through new investments, including launching Hassan Allam Utilities, Hassan Allam Holding’s investment and development arm, which currently has assets under management exceed bal contractors and engineering firms and continues to be the leading contractor and investor for strategic projects.
