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问题 单项选择题 A3/A4型题

男，16岁，咽异物感6年，无咽部出血及吞咽障碍。检查：舌根部中央有半球形肿物隆起，粘膜光滑，质地中等。颈部淋巴结不大。

如果碘同位素检查示舌根肿物有核素聚焦，而颈部无核素聚焦，正确的治疗是（）。

A.暂观察

B.手术切除

C.硬化剂注射

D.冷冻治疗

E.激光治疗

答案

参考答案：A

问答题

简单介绍汉代丝绸之路的主要路线。

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单项选择题

One of the most widely used routing protocols in IP networks is the Routing Information Protocol (RIP). RIP is the canonical example of a routing protocol built on the ___25___ algorithm. Routing protocols in intemetworks differ slightly from the idealized graph model. In an internetwork, the goal of the routers to forward packets to various ___26___.

Routers running RIP send their advertisement about cost every ___27___ seconds. A router also sends an update message whenever an update from another router causes it to change its routing table.

It is possible to use a range of different metrics or costs for the links in a routing protocol. RIP takes the simplest approach, with all link costs being equal ___28___. Thus it always tries to fend the minimum hop route. Valid distances are 1 through ___29___. This also limits RIP to running on fairly small networks.

25（）

A. distance vector

B. Link state

C. flooding

D. Minimum spanning tree
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