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炭:概述其特性和用途
harmonylqep478668
12 days ago
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يُعرَّف فحم بأنه مادة خشبية ناتجة عن احتراق المواد العضوية في غياب الأكسجين. يُستخدم الفحم الطبيعي على مدى القرون لعدة
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