If you want to go, I would give you my advice that you take an umbrella.
查看答案
最常用的普通包合材料
A. Β-环糊精
B. Α-环糊精
C. Γ-环糊精
D. 羟丙基-Β-环糊精
E. 乙基化-Β-环糊精
可用作缓释作用的包合材料
A. Β-环糊精
B. Α-环糊精
C. Γ-环糊精
D. 羟丙基-Β-环糊精
E. 乙基化-Β-环糊精
We have the same problem as you concerning the learning of English.