题目内容

下列哪些性质可用于生物碱的分离( )。

A. 酸性
B. 碱性
C. 极性
D. 溶解度
E. 旋光性

查看答案
更多问题

麻黄碱、烟碱具有挥发性,可用( )法提取;咖啡因具有( )性。

Choose the most appropriate word or phrase to complete each of the following sentences.The claims have received independent _______ from a team of experts.

A. contamination
B. confirmation
C. adolescence
D. nonsense

The Prime Minister is to meet his European _______ to discuss the war against drugs.

A. disbelief
B. counterpart
C. fitness
D. mortality

The aim is to promote closer economic _______.

A. humidity
B. integration
C. pedestrian
D. legibility

答案查题题库