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二、講新課 教师首先扼要地介紹元素分类簡史,并指出进行总结时应注意的思考方法,他把历史經驗与学生習慣的思考方法結合起来,使学生了解門捷列夫之前达到怎样的認識,应該怎样进一步發展理論。所以他并不煩(?)地講細节,而是着重說明历史經驗,说明依据原子量將凌乱无章的元素加以系统化这种思想的历史發展。他指出,总結規律第一要依据必要的具体材料,第二要运用辯証的思想方法。在早期,人們曾將元素分为金
Second, the new lesson stresses teachers Briefly introduce the brief history of element classification and point out the thinking method that should be paid attention to when summarizing. He combines the historical experience with the thinking method of students’ habits to make students understand what Mendeleev did before Understanding, how to further develop the theory. Instead of annoying (?) Speaking in detail, he focuses on historical experience, illustrating the historical development of the idea of systematizing disorganized elements based on atomic weight. He pointed out that the law of summing up must first be based on the necessary concrete materials, and the second is to use dialectical methods of thinking. In the early days, people had divided elements into gold