Concave
发表于 2025-3-21 17:58:12
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钢笔记下惩罚
发表于 2025-3-21 21:15:53
The Chemistry and Reactivity of Silk, was practiced in the Far East over 4000 years ago. The first recorded commercial production was during the reign of the Chinese emperor Huang Ti in 2640 B.C. This emperor based the Chinese economy on silk production and the fiber had a vital role as a medium of exchange within the country, as well
convert
发表于 2025-3-22 02:42:34
The Histology of Keratin Fibers, and appendages of the higher vertebrates and whose prime function is to protect the animals from their environment. They are composed mainly of protein and are characterized by their high cystine content(.) and birefringence(.) and by the fact that they yield an α-type X-ray diffraction pattern whi
无能力
发表于 2025-3-22 07:27:25
The Chemical Composition and Structure of Wool,ine was isolated from wool, which can thus lay claim to a long history in protein chemistry. Other early investigators attempted to use the techniques of elementary analysis to derive an empirical formula for wool, but it was speedily recognized that the molecule was far too complex to be handled in
苍白
发表于 2025-3-22 11:01:36
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贪婪的人
发表于 2025-3-22 13:01:34
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贪婪的人
发表于 2025-3-22 18:59:33
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mendacity
发表于 2025-3-23 01:09:06
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Fecundity
发表于 2025-3-23 03:11:38
Other Animal Fibers, to 1957 only three are known to have been published and all are out of print.(.) Insofar as the chemistry of animal fibers is concerned, they are of very limited interest. Some brush filling materials are obtained from furbearing animals, and furs are described in books by Links(.) and Bachrach, (.
天文台
发表于 2025-3-23 06:06:18
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