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问题 单项选择题 B型题

能够抑制细菌细胞壁合成的药物是（）

A．青霉素 

B．链霉素 

C．万古霉素 

D．磺胺嘧啶 

E．甲氧苄啶

答案

参考答案：A

解析：

本题考察的是药物的作用机制。此类考点为考试的重点。典型药物的作用机制应用范围应用比较法牢记。

单项选择题

患者男性，44岁，腹胀2年，查体示巨脾，脾切除术能治疗下列哪种疾病

A．缺铁性贫血
B．遗传性球形细胞增多症
C．自身免疫性溶血性贫血
D．海洋性贫血
E．丙酮酸激酶缺乏
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单项选择题

Border Gateway Protocol(BGP) is inter-autonomous system （1） protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest （2）count is not the preferred route. For example, we may not want a packet through an autonomous system that is not secure even though it is shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without defining the path that leads to that（3）A router that receives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link （4）. routing is also not a good candidate for inner-autonomous system routing because an internet is usually too big for this routing method. To use link state routing for the whole internet would require each router to have a huge link state database. It would also take a long time for each router to calculate its routing （5） using the Dijkstra algorism.

（2）是（）

A.path

B.hop

C.route

D.packet
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