鹅、鸭羽毛羽绒结构特征_政策法规 关键词： 羽毛羽绒；形态结构；节点；组成基团；结晶度 [gap=545]Keywords： Down and Feather；Morphological Structure；Node；Composition Group；Crystallinity
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吡啶基及其衍生物由于它们特有的活性，已成为新医药和农药开发中重要的组成基团。
With the special activity, pyridyl and its derivatives have been important structures in developing medicine and pesticide.
20种不同的有机分子结合起来组成多肽链或蛋白质。这20个氨基酸主结构相同，但每种又分别有各自不同的侧基团。
One of the 20 different organic molecules that are joined together to form a polypeptide chain or a protein the twenty amino acids share a common backbone, but each has a specific side-group.
不同类桥联基团根据它们的化学组成能提高玻璃化温度。
Heterogeneous bridging groups can raise the glass temperature according to their chemical composition.
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