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ما الفرق بين الحديد الاملس والمشرشر السيخ ؟؟؟ ومواصفات كل منهم الكيميائية والفيزيائية ؟؟؟

البحوث التقنية
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Question added by جمال رمضان رمضان
Date Posted: 2018/08/27
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