纯字母框图推断题就是框图中只有字母,没有反应条件、物质分类、颜色等文字条件。框图只反映物质间的转化关系或反应关系,图形和文字相对独立,相互剥离,这是推断题中较难的类型。此类推断题既能有效考查学生的逻辑思维、分析推理能力,又能考查学生对多种信息的整合能力,因此备受中考命题者的推崇。本文精选几道此类例题进行分析,以帮助考生归纳解题的一般思路和规律。 Pure letter block diagram inferred that the block diagram is only letters, no reaction conditions, material classification, color and other text conditions. Block diagram only reflects the transformation of relations between substances or response, graphics and text relatively independent, mutual stripping, which is more difficult to infer the type of question. Such inference questions can not only effectively examine the students ’logical thinking, analyze the reasoning ability, but also examine the students’ ability to integrate many kinds of information. This selection of several examples of such examples for analysis to help candidates generalize the problem-solving ideas and laws.