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问题 多项选择题

下列属于禁止内幕交易主要措施的是（）。

A.加强自律管理

B.建立防火墙制度

C.加强监管

D.完善法制

答案

参考答案：A, C

解析：禁止内幕交易主要的措施是加强自律管理和加强监管。

单项选择题 A型题

细菌芽胞所特有的并与其高度耐热性有关的成分是（）

A.磷脂

B.肽聚糖

C.磷壁酸

D.吡啶二羧酸

E.二氨基庚二酸
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单项选择题

One of the difficulties in building an SQL-like query language for the Web is the absence of a database （） for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files. Thus, at the highest level of （） , every such document is identified by its Uniform Resource Locator (URL), has a （） 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 set of all HTML documents as a relation: Document(url, title, text, type, length, modif)Where all the （） are character strings. In this framework, an individual document is identified with a （） in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.

at the highest level of （）

A．protocol

B．control

C．abstraction

D．presentation
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