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炭:概述其特性和用途
allengtao471446
19 hours ago
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يُعرَّف فحم طبيعي بأنه مادة وخشبية ناتجة عن احتراق المواد العضوية في غياب الهواء. يُستخدم الفحم الطبيعي على مدى القرون
https://aliviapofp949436.mpeblog.com/64461435/فحم-طبيعي-لمحة-عن-خصائصه-و-استخداماته
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