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临界问题,就是指物体从一种状态转变为另一伏态时,有关物理量达到极限值,物体所处的状态或条件发生突变。其特点是:物理量取值的有界性和突变条件的隐含性。学生由于习惯解决条件显性和取值无界的问题,遇到临界问题时,常无从下手。而临界问题在历年高考中不断出现。本文试图分析一些193l～1903年高考试题中的临界问题,指出其主要表现形式,供同行参考。
The critical issue refers to the fact that when an object changes from one state to another, the relevant physical quantity reaches the limit, and the state or condition of the object mutates. Its characteristics are: the boundedness of physical values and the implicit conditions of mutation. Because students are accustomed to solving the problems of explicit conditions and unbounded values, they often have no way of starting when they encounter critical problems. The critical issue has continued to appear in the college entrance examination over the years. This article attempts to analyze some of the critical questions in the 1931-1903 exam questions and points out its main forms of expression for reference by peers.