对生物碱进行分离时,可利用
A.碱性差异
B.溶解性差异
C.分子大小差异
D.特殊官能团差异
E.极性差异
参考答案:A,B,D,E
咽喉肿痛宜选
A.蒲公英
B.大青叶
C.山豆根
D.野菊花
E.升麻
Foreign disinvestment and the______of South Africa from world capital markets after 1985 further weakened its economy.
A.displacement
B.elimination
C.exclusion
D.exception