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炭:概述其特性和用途
joshkwmr506820
20 hours ago
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يُعرَّف فحم بأنه مادة وخشبية ناتجة عن احتراق المواد الطبيعية في غياب الكمية الكافية من الأكسجين. يُستخدم الفحم الطبيعي
https://jeanfrnj355589.blogpixi.com/profile
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