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问题 单项选择题

如果一个类含有一个以上的纯虚函数，则称该类为

A．虚基类

B．抽象类

C．派生类

D．以上都不对

答案

参考答案：B

解析： 纯虚函数一般提供派生类进行继承的参考，是多态性的重要保证，一个具有纯虚函数的类称为抽象类，抽象类可以具有其他类的特点，但不能实例化，其主要目的是作为派生类的基类存在，处于类层次的高层。

问答题

Alexander has been the general director of -ZAO- JKL for three months. He has a fi xed term contract with the company that expires in 21 months time. On his appointment he was considered to have all the necessary skills to make the company more competitive. As Alexander owns 12% of the shares in the company, he was also regarded as a person who would be highly committed to the future of -ZAO- JKL.The internal auditor recently informed the board of directors of some disturbing facts. In the course of their duties they discovered that Alexander had records of ongoing discussions with key executives of -ZAO- PQR, the company’s main competitor. These records included notes that contained sensitive information on the sales performance and marketing plans of -ZAO- JKL, and it was quite clear that these had been discussed with the executives of the competitor.When the board of directors asked Alexander for an explanation of his actions, he replied that his actions were totally appropriate as it was common business practice to interact with other infl uential people in the industry and that there would be benefi ts for both companies.The board of directors was not satisfi ed with Alexander’s explanation and decided that they would need to consider Alexander’s future position in the company, as well as any action that might be taken to remedy any losses infl icted on the company by his actions.Required:

(a) Discuss the potential actions that may be instigated by -ZAO- JKL against Alexander. (6 marks)
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名词解释

半纤维素
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