List the main differences in molar mass between polymers and other chemical compounds. ( answer in English)
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Explain the terms of "mono-disperse" and "polydispersity index".( answer in English)
列出测定聚合物分子量及其分布的三种主要方法。并阐述基本原理,基本过程。
Based on "ball-and-stick"model, list the main factors that determin the possible shapes and sizes of polymer molecules. (answer in English)