题目内容

溶剂法分离麻黄碱和伪麻黄碱的依据是

A. 磷酸盐溶解度差
B. 草酸盐溶解度差
C. 酒石酸盐溶解度差
D. 硫酸盐溶解度差

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A. 二硫化碳-碱性硫酸铜反应
B. 茚三酮反应
C. 漂白粉实验
D. 氯仿-浓硫酸反应

What aspects should be included in describing a product?

A. size
B. color
C. shape
D. material
E. place

Which comparative is wrong?

A. soft,softer
B. big,biger
C. happy, happier
D. beautiful,more beautiful

What are included in a catalog?

A. colors
B. prices
C. models
D. sizes
E. styles