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炭:概述其特性和用途
janiceauus470139
1 day 13 hours ago
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يُعرَّف فحم بأنه مادة عضوية ناتجة عن احتراق المواد العضوية في غياب الهواء. يُستخدم الفحم الطبيعي على مدى القرون لعدة
https://saulhkii492006.levitra-wiki.com/user
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