关于维生素A醋酸酯的说法,错误的是 (  )

关于维生素A醋酸酯的说法,错误的是 (  )A.维生素A醋酸酯对酸不稳定 B.维生素A醋酸酯对紫外线稳定 C.维生素A醋酸酯易被空气氧化 D.维生素A醋酸酯化学

查看答案

二氢吡啶类药物硝苯地平遇光极不稳定,可能产生的光化产物 (  )

二氢吡啶类药物硝苯地平遇光极不稳定,可能产生的光化产物 (  )

查看答案

__________ English book in the reading-room.Please go and

__________ English book in the reading-room.Please go and get it for me. A.for

查看答案

What does the man mean?

What does the man mean?A.He agrees with the woman. B.He prefers to travel by shi

查看答案

The policeman told the boys__________in the street.

The policeman told the boys__________in the street. A.not to play B.don’t play

查看答案