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问题 单项选择题

与急性坏死性溃疡性龈炎关系最密切的细菌为

A．梭形杆菌、螺旋体与中间普氏菌

B．梭形杆菌与牙龈卟啉菌

C．放线放线共生杆菌与螺旋体

D．黏性放线菌与螺旋体

E．伴放线放线杆菌

答案

参考答案：A

解析：梭形杆菌、螺旋体与中间普氏菌是急性坏死性溃疡性龈炎的优势菌。

单项选择题

A群链球菌与其它链球菌的主要鉴别试验是（）

A.淀粉水解试验

B.菊糖发酵试验

C.Optochin敏感试验

D.杆菌肽敏感试验

E.新生霉素敏感试验
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单项选择题

Border Gateway Protocol(BGP) is inter-autonomous system (96) 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 (97) count is not the preferred route. For example, we may not want a packet through an not secure even though it is the 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 actually defining the path that leads to that (98) . 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 (99) routing is also not a good candidate for inter-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 rousting (100) using the Dijkstra algorism.

（100）是（）

A.table

B.state

C.metric

D.cost
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