问题 单项选择题

渗透泵片剂控释的基本原理是

A.减小溶出

B.片外渗透压大于片内,将片内药物压出

C.片剂外面包控释膜,使药物恒速释出

D.减慢扩散

E.片剂膜内渗透压大于片剂膜外,将药物从细孔压出

答案

参考答案:E

解析:渗透泵型片剂的释药原理是水通过半透膜进入片芯,使药物溶解成饱和溶液,加之片芯内具有高渗透压的辅料的溶解产生渗透压,形成膜内渗透压高于膜外,将药物从膜的细孔持续泵出。因此渗透泵型片剂的释药动力是渗透压。

阅读理解

Valencia is in the east part of Spain(西班牙). It has a port on the sea, two miles away on the coast. It is the capital of a province that is also named Valencia.

The city is a market centre for what is produced by the land around the city. Most of the city’s money is made from farming. It is also a busy business city, with ships, railways, clothes and machine factories.

Valencia has an old part with white buildings, colored roofs, and narrow streets. The modern part has long, wide streets and new buildings. Valencia is well known for its parks and gardens. It has many old churches and museums. The University in the centre of the city was built in the 13th century.

The city of Valencia has been known since the 2nd century. In the 8th century it was the capital of Spain. There is also an important city in Venezuela(委内瑞拉)named Valencia.

小题1:From the text, how many places have the name Valencia?

A.One.  

B.Two.

C.Three.     

D.Four.小题2:What is the main difference between the two parts of the city?

A.The color of the buildings.

B.The length of the streets. 

C.The age of the buildings.

D.The color of the roofs.小题3:When was Valencia the most important city in Spain?

A.2nd century.

B.8th century.

C.13th century.

D.20th century.小题4:What is Valencia famous for?

A.Its seaport.

B.Its University.

C.Its churches and museums.

D.Its parks and gardens.小题5:The main income of the city of Valencia is from its_____.

A.markets.

B.business.

C.factories.

D.farming.

名词解释