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问题 单项选择题 A1型题

在哪个颌位，髁突位于下颌窝中的最后位置（）

A.牙尖交错位

B.后退接触位

C.下颌姿势位

D.前伸颌位

E.侧方颌位

答案

参考答案：B

解析：牙尖交错所确定的就是牙尖交错位，又称为牙位；咀嚼、言语、吞咽等功能活动，均与牙尖交错位关系密切，是下颌的主要功能位，故1、2题均选A；后退接触位时，下颌可以作侧向运动，3题选B；下颌姿势位时，上下牙均无接触，上下颌牙之间从前向后有一楔形间隙，称为息止间隙，4题选C；后退接触位时，髁突位于其在下颌窝中的最后位置，5题选B。

填空题

（），字玄晖，以善于写（）诗见长，风格（），与谢灵运前后齐名，世称“小谢”。
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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. DNAB. SNAC. the OSI D. the ISO
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