萃取精馏组分间的相对挥发度是借助萃取剂的加入量来调节的,并随萃取剂在液相中浓度的上升而增大。
参考答案:对
What does your brother do? [ ]
A. He works very hard.
B. He is outgoing and friendly.
C. He is a sales assistant.
D. He is tall with curly hair.
保险监督管理的依据是有关的法律、行政法规、规章和规范性文件。其中,( )是指国务院制定和发布的条例。
A.法律
B.行政法规
C.规章
D.规范性文件