题目内容

双层渗透泵片处方中的推动剂是

A. 醋酸纤维素
B. 氯化钠
C. 聚氧乙烯(分子量20万~500万)
D. 硝苯地平
E. 聚乙二醇

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中国原始农业是在采集经济中为开辟食物来源而发明的。

膜剂的常用膜材

A. 氟氯烷烃
B. 丙二醇
C. PVP
D. 枸橼酸钠
E. PVA

气雾剂的抛射剂

A. 氟氯烷烃
B. 丙二醇
C. PVP
D. 枸橼酸钠
E. PVA

The second paragraph is meant to show that

A. Martin Eden enjoyed reading books of different themes.
B. Martin Eden began to encounter different new ideas.
C. Martin Eden didn"t have very efficient learning method.
D. Martin Eden was a hardworking and modest person.

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