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患者女，45岁，上颌左上6421右上456缺失，余留牙正常，行可摘局部义齿修复 。

卡环臂进入基牙倒凹的长度为卡环臂全长的 （）

A.1／2

B.1／3

C.1／4

D.1／5

E.2／5

答案

参考答案：A

单项选择题

SOX is an alternative（）for XML. It is useful for reading and creating XML content in a（）editor. It is then easily transformed into proper XML. SOX was created because developers can spend a great deal of time with raw XML. For many of us, the popular XML（）have not reached a point where their tree views, tables and forms can completely substitute for the underlying（）language. This is not surprising when one considers that developers still use a text view, albeit enhanced, for editing other languages such as Java. SOX uses（）to represent the structure of an XML document,which eliminates the need for closing tags and a number of quoting devices. The result is surprisingly clear.

It is useful for reading and creating XML content in a（）editor.

A．graphic

B．program

C．command

D．text
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填空题

Windows 98中的文件管理系统从逻辑结构上看，大致分为三个层次：第三层是输入输出子系统，第二层是各种文件系统，第一层为______。
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