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لماذا يتم وضع حديد ثانوى بالرغم من عدم الحاجة ليه؟؟؟

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Question added by Mahmoud Mostafa Dora , Structural Engineer , MHEC
Date Posted: 2014/09/20
فارس الخليلي
by فارس الخليلي , Safety director , National Company for Education

تدعيم

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