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炭:概述其特性和用途
sachinbjgk890110
1 day 6 hours ago
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يُعرَّف فحم طبيعي بأنه مادة عضوية ناتجة عن احتراق المواد العضوية في غياب الكمية الكافية من الأكسجين. يُستخدم الفحم
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