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问题 单项选择题

牛腭扁桃体位于（）

A．喉咽部

B．口咽部侧壁

C．舌根部背侧

D．软腭口腔面

E．鼻咽部后背侧壁

答案

参考答案：B

解析：

扁桃体由淋巴组织构成，既有弥散淋巴组织，也有淋巴小结，分布于舌、咽等处上皮下结缔组织中，为机体重要的防御器官。反刍兽具有腭扁桃体窦，腭扁桃体位于咽部侧壁、腭舌弓和腭咽弓之间。因此牛腭扁桃体位于口咽部侧璧。

单项选择题

隋唐时期最主要的人才选拔制度是（）

A、科举制

B、世袭制

C、察举制

D、九品中正制
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单项选择题

Typically, these are concern with the establishment of (66) the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (67) interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be (68) For example, one computer may be a small single -user computer, while another may be a large (69) system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (70) , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

A．DNA

B．SNA

C．the OSI

D．the ISO
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