框图推断题是中考化学试题中的一种十分重要的题型,这类题具有条件隐蔽、关系复杂、思维强度大、综合性强等特点,是近年来中考必考的热点题型。在近年来各地中考中,框图推断题的命题水平越来越高,试题的灵活度也越来越大,在考查知识的同时侧重考查学生的分析、推理、综合应用知识等 The block diagram inference questions is a very important question type in senior high school entrance examination questions. These questions have the characteristics of concealed conditions, complicated relations, strong thinking intensity and strong comprehensiveness. They are the hot questions in recent years. In recent years in various places in the examination, the block diagram inference proposition level is higher and higher, the flexibility of the test is also increasing, while examining the knowledge focused on examining students analysis, reasoning, comprehensive application of knowledge