“方案选择”问题 ,近几年成为教学与考试的热门话题 ,其中开放型占多数 ,也有普通题型 ;就内容而言应用型较多 ,也有纯数学知识型 这类题形式多样 ,内容广泛 举例说明如下 ,供同学们复习参考 1、已知方案的优化选择例 1　国家电力总公司为了改善农村用电电费过高的现状 ,目 The issue of “program selection” has become a hot topic in teaching and examination in recent years. Among them, the open type accounts for the majority, but there are also general type questions; in terms of content, there are many types of applications, and there are also pure mathematical knowledge types. For example, as follows, for the students to review Reference 1, the optimization of the known options Example 1 State Electric Power Corporation in order to improve the status of rural electricity tariffs are too high, the project