解答物质推断题的一般思路:读题、审题→寻找“题眼”→根据各种特征采取推断技巧→得出结论→给予验证。下面就向同学们介绍几种常用的推断技巧。一、筛选法该法就是根据题中每一步实验及现象进行推理,逐步筛出不可能存在的物质,去伪存真,保留合理的成分,最后归纳出正确的结论 Answer the general idea of ​​material deduction questions: reading questions, examining questions → searching for “eyes” → inferring skills based on various characteristics → drawing conclusions → giving validation. Here are some of the commonly used inference techniques introduced to classmates. First, the screening method The method is based on each step in the experiment and the phenomenon of reasoning, and gradually sieve out the impossible material, to preserve the truth, to retain the reasonable ingredients, and finally summed up the correct conclusions