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《砂和粘土》是小学自然教材第一册第7课的内容。本课选取砂和粘土作为研究材料,目的是要使学生在自己原有的知识的基础上了解砂和粘土在颗粒和粘性方面的特点。 本课旨在通过比较砂和粘土颗粒大小和粘性的不同培养学生的比较能力。
“Sand and Clay” is the seventh volume of Volume One of the Natural Primary School Textbook. Sand and clay are selected as research materials in this course to enable students to understand the characteristics of sand and clay in terms of grain and viscosity based on their own knowledge. This lesson aims to develop students' comparative abilities by comparing sand and clay particle sizes and viscosities.