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问题 单项选择题

某患者，发现右侧颈动脉三角区肿块3年，渐大，触诊质地软，有弹性及搏动。听诊有血管杂音，压迫颈动脉近端肿块明显缩小，搏动减弱。其最有可能的诊断是（）

A.颈淋巴结炎

B.颈淋巴结核

C.鳃裂囊肿

D.颈动脉体瘤

E.颈动脉瘤

答案

参考答案：E

单项选择题

The presentation layer is concerned with the (1) and semantics of the information exchanged between two systems. The processes in two systems are usually exchanging information in the form of character(2), numbers, and so on. The information should be changed to bit (3) before being transmitted. Because different computers use different encoding systems, the presentation layer is responsible for(4) between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent format into a common format. The presentation layer at the receiving machine changes the common format into its(5)-dependent format.

空白（4）处应选择（）

A.capability

B.interoperability

C.reliability

D.dependability
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问答题 简答题

SDH网络的保护结构包括哪两种？
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