2008年高考北京卷第20题:有一些问题你可能不会求解,但是你仍有可能对这些问题的解是否合理进行分析和判断.例如从解的物理量单位,解随某些已知量变化的趋势,解在一些特殊条件下的结果等方面进行分析,并与预期结果、实验结论等进行比较,从而判断解的合理性或正确性.例.如图1所 The 2008 Beijing Entrance Examination Question 20: There are some questions that you may not be able to solve, but you may still be able to analyze and determine whether the solutions to these questions are reasonable. For example, from the solution of physical units, the solution changes with some known quantity. The trend, the solution in some special conditions and other aspects of the results of analysis, and with the expected results, experimental conclusions, etc., to determine the rationality or correctness of the solution. Example.