近年来中考命题加大了实验考查的力度,更加注重实验方案的设计和评价.实际上“评价”、“改进”、“创新”是认识领域中的最高的水平,更是一种具有创造性的工作,由于它集问题、讨论、操作、方法、表达、结论和计算于一体,所以它是化学实验中难度最大、综合性最强、能力要求相对较高的一类试题.它既需要牢固的基础知识和较强的实验操作基 In recent years, senior high school entrance examination proposition to increase the strength of the experimental test, pay more attention to the design and evaluation of experimental programs.In fact, “evaluation ”, “improvement ”, “innovation ” is the highest level in the field of understanding It is a creative work. Because it combines questions, discussions, operations, methods, expressions, conclusions and calculations, it is a type of test that is most difficult, comprehensive and compelling in chemistry experiments It requires both a solid foundation and a strong experimental base