jarring
发表于 2025-3-28 16:25:12
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的染料
发表于 2025-3-28 19:10:47
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祖传
发表于 2025-3-29 00:51:26
Coal, the ,,tures commonly called the coal macromolecules. These macromolecules may vary widely in their chemical and physical properties . Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen . Indeed, coal (from old English
不能仁慈
发表于 2025-3-29 04:05:34
Graphite: Carbon the Gray,m Gottlob, in the year 1789. The old European name is plumbago, meaning .. The name lead (.) used to mean that graphite is being used in . and should not be mixed up with the . (., as we can see in the periodic table of the elements.. These two are completely different materials, because . (Pb) is a
Abbreviate
发表于 2025-3-29 10:57:53
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鞠躬
发表于 2025-3-29 14:32:42
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关心
发表于 2025-3-29 15:54:59
The Transparent Carbon: the Diamond,ht of diamond make it useful for both industrial applications and jewelry. The Gemological Institute of America (GIA) classifies natural diamonds from D grade (colorless) to Z grade (light yellow). The blue diamonds fall under a different grading scale .