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问题 单项选择题

男性血尿患者，膀胱镜检发现左输尿管口周围膀胱黏膜充血、水肿，散在几个米黄色粟粒大小的小结节。还应作下列哪项检查______

A．膀胱造影
B．膀胱区B超
C．残余尿量测定
D．尿流动力学检查
E．膀胱活检

答案

参考答案：E

填空题

将收集到的40个数据进行整理分组，已知落在某一区间内的频数是5，则该组的频率是（    ）。
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单项选择题

One of the difficulties in building an SQL-like query lange for the Web is the absence of a database schema for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual (66) from the implicit structure of these files. Thus, at the highest level of (67) , every such document is identified by its Uniform Resource Locator (URL), has a title and a text Also, Web servers provide some additional information such as the type, length, and the last modification date of a document. So, for data mining purposes, we can consider the site of all HTML documents as arelation:
Document (url, (68) , text, type, length, modify)
Where all the (69) are character strings. In this framework, anindividual document is identified with a (70) in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will de left blank, but this is not uncommon in any database.

A．presentation

B．control

C．abstraction

D．protocol
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