题目内容
acetone _____________。
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Many important industrial compounds such as ethanol, acetic acid, organic acids, butanol and acetone were being produced by the end of 19th century by microbial fermentation procedures that were open to the environment.
Isolated enzymes have long been a part of many biotechnological possesses and their catalytic properties are being further-utilized with the development of suitable immobilization techniques allowing reuse of the biocatalyst.
经社理事会的主要职权是（ ）。
联合国人权委员会是（ ）的一个机关。
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