Manifest
发表于 2025-3-23 12:20:12
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美学
发表于 2025-3-23 13:57:01
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纬线
发表于 2025-3-23 19:25:45
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受辱
发表于 2025-3-24 01:10:44
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施魔法
发表于 2025-3-24 06:21:56
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SKIFF
发表于 2025-3-24 10:27:42
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键琴
发表于 2025-3-24 13:28:05
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avulsion
发表于 2025-3-24 17:34:16
Aminopolymers,olymers of this type which have been investigated, only two are currently of appreciable commercial importance, namely urea-formaldehyde and melamine-formaldehyde polymers. In addition, melamine-phenol-formaldehyde and benzoguanamine-formaldehyde polymers find limited application. In the past there
尊敬
发表于 2025-3-24 22:41:50
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土坯
发表于 2025-3-25 00:00:26
Polydienes,s together with the products of polymerization and copolymerization of conjugated dienes. These various materials make up the contents of this chapter. The importance of the polydienes lies in the fact that they encompass the bulk of the commercial elastomers currently in use.