游牧
发表于 2025-3-21 17:46:15
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骄傲
发表于 2025-3-21 21:22:56
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漂亮
发表于 2025-3-22 01:08:01
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开始从未
发表于 2025-3-22 06:42:32
Polyurethanes,The group of polymer products called polyurethanes covers a wide range of structural forms. This is due to the versatility of the reactions of the isocynate group (-NCO) and the ingenuity of polymer scientists in tailoring polymer structures to provide required physical properties.
情节剧
发表于 2025-3-22 09:07:25
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表示问
发表于 2025-3-22 12:56:24
Polymer structures and general properties,o infinity depending on the type and structure. The majority of useful polymers are organic chemicals which is to say that they are based upon the elements carbon and hydrogen. They occur in nature as starches, cellulose and proteins for example and some of these are chemically converted into useful
摇晃
发表于 2025-3-22 19:44:45
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合法
发表于 2025-3-22 21:28:51
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俗艳
发表于 2025-3-23 04:36:25
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GRATE
发表于 2025-3-23 08:14:46
Ionic polymers, methods, nor to those that, fortuitously, have ionic end-groups. We will discuss mainly the types which fall within the scope of conventional organic polymer chemistry. Ionic polymers are specialist materials, some of which have limited, though important, commercial applications. Many are modificat