对于一些有相当难度的选择题,许多考生往往花费较大的精力和时间也找不到正确的答案。那么我们如何应对这样的题目呢?哪就是针对不同的题目,应依据不同的理论,采用排除法妙解此类难题。应用排除法在求解某些题目时可以排除掉所有的干扰选项,从而选出正确选项;在求解某些题目时可以排除部分干扰选项,从而大大提高正确解题的几率。排除法中经常用到特殊值法(主要是极限法)和量纲 For some quite difficult multiple-choice questions, many candidates often spend more energy and time can not find the correct answer. So how do we deal with such problems? Which is for different topics, should be based on different theories, the use of exclusion method to solve such problems. Applying the exclusion method can solve all the perturbation options when solving certain questions, so as to select the correct options. When solving certain problems, you can exclude some of the interference options, thereby greatly increasing the probability of correct problem solving. Exclusion method often used special value method (mainly limit method) and dimension