single carboxylic acids合适翻译？整句呢? illustrative carboxylic acids include acetic acid, propionic（拼写有误吧？） acid and butyric acid. the preferred carboxylic acid starting material is acetic acid. most preferably, the carboxylic acid starting materials are purified single carboxylic acids, although mixtures of such acids could be employed if desired. 例如，羧酸包括乙酸、丙酸和丁酸。优先选用的羧酸开工原料是乙酸。羧酸开工原料最好使用纯净的同种羧酸，但是不得已时羧酸的混合物也可使用。查看更多
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