题目内容

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

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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.

No difficulty, no fun.

Totally alone in the room，her mother wanted to find someone to talk to.