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Polyester resins are the condensation products of polybasic acids and polyols.

聚酯树脂是多元酸和多元羟基化合缩聚而成.

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Objective To analyze polybasic acids and higher fatty acids Rosa roxburghii Tratt fruit.

目的分析刺梨果中多元酸和高级脂肪酸的组成.

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