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炭:概述其特性和用途
louisehzfp959594
14 hours ago
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يُعرَّف فحم طبيعي بأنه مادة خشبية ناتجة عن احتراق المواد الخشبية في غياب الكمية الكافية من الأكسجين. يُستخدم الفحم
https://kaitlynzmoy947436.wikifordummies.com/user
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