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炭:概述其特性和用途
violamvsm327002
19 hours ago
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يُعرَّف فحم طبيعي بأنه مادة وخشبية ناتجة عن احتراق المواد الخشبية في غياب الهواء. يُستخدم الفحم الطبيعي على مدى القرون
https://laytncynm096273.wikissl.com/user
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