题目:
A. Three. B. Four. C. Five. 小题2: What dessert would you like best? A. Sandwich with egg. B. Coffee. C. Chocolate. 小题3: How much is the rice with chicken and a glass of orange juice? A. $6.50. B. $4.80. C. $7.50. |
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D解析: 根据碱或盐在溶剂中的溶解性不同来分离混合物,麻黄碱和伪麻黄碱的草酸盐,前者的草酸盐在水溶液中溶解度小;小檗碱和其共存的碱的盐酸盐,前者在酸水中溶解度大;奎宁和其共存的生物碱的硫酸...