任何解题过程都是实现信息与问题的转化过程。构造法就是利用设计、等价、替代、假想、隔离等思维方式,将直接难以解答的问题构造为另一类等价的较易解决的问题,从而使问题得以解决。例1 一个真空密闭容器中盛有 lmolPCl_5,加热到200℃时,发生如下变化:PCl_5 Any problem-solving process is the process of transforming information and problems. The construction method is the use of design, equivalents, substitution, hypothesis, isolation and other thinking methods, constructing directly difficult questions as another kind of equivalent and easily solved problem, so that the problem can be solved. Example 1 A vacuum sealed container containing lmolPCl_5, when heated to 200 °C, the following changes occurred: PCl_5