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问题 单项选择题

审批通风、熏蒸等重要仓储作业方案，对通风、熏蒸等作业方案的合理性和用药的安全性负责是粮油仓储单位（）的具体职责。

A.分管环保工作负责人

B.粮油保管员

C.分管质量检查工作负责人

D.分管仓储工作负责人

答案

参考答案：D

判断题

呼吸衰竭已昏迷，大量痰液阻塞气道，一个错误的治疗是使用呼吸兴奋剂。
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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 (131) 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 (132) , every such document is identified by its Uniform Resource Locator (URL), and a (133) and a text. Also, Web severs 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, rifle, text, type, length, modif)
Where all the (134) are character strings. In this framework, an individual document is identified with a (135) 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.

A．relation

B．field

C．script

D．tuple
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