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在化学选择题中,有些习题由于命题者的巧妙设置,使解题条件隐蔽而抽象,很难被应试者直接取用。如果在保持问题本质不变的前提下,对题给信息进行合理的变换,使隐蔽条件明朗化,抽象条件具体化,复杂问题简单化,将大大提高解题速度。下面笔者列举几种换元技巧,供参考。
In the chemistry multiple-choice questions, some of the exercises are cleverly set up by the propositioners, making the problem-solving conditions subtle and abstract and difficult to be directly accessed by the candidate. If we keep the nature of the problem unchanged, we can reasonably transform the information given to the title to clarify the hidden conditions, specify the abstract conditions, and simplify the complex issues, which will greatly increase the speed of problem solving. Below, I will give you a few examples of techniques for reference.