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问题 单项选择题 B1型题

溃疡周围上皮呈假上皮瘤样增生，腺小叶坏死被鳞状细胞团替代的是（）。

A.舍格伦综合征

B.涎石病

C.坏死性涎腺化生

D.慢性涎腺炎

E.鳃裂囊肿

答案

参考答案：C

解析：

本题考查了几种疾病的病理学改变。

单项选择题

当空气中氧气浓度降到（）时，人会感到呼吸困难。

A.18%

B.16%

C.15%

D.12%
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单项选择题

TCP/IP (1) layer protocols provide services to the application (2) running on a computer. The application layer does not define the application itself, but rather it defines (3) that applications need — like the ability to transfer a file in the case of HTTE In short, the application layer provides an (4) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (5) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

5（）

A.application 

B.session 

C.physical 

D.transport
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