《全日制义务教育教学课程标准》指出:“在教学时要遵循学生的认识规律,重视学生获取知识的思维过程,通过动手操作观察,引导学生进行分析、比较、综合,在感性材料的基础上加以抽象、概括,进行简单的判断、推理,教师在教学中应当发挥好教具和学具的演示以及操作的育人功能,发展学生的观察和思维能力,培养学 The full-time compulsory education curriculum standard states: ”In teaching, students should follow the law of cognition, attach importance to students thinking process of acquiring knowledge, through hands-on observation, guide students to analyze, compare, synthesize, based on perceptual material On the abstraction, generalization, simple judgment, reasoning, teachers in teaching should be good teaching aids and teaching demonstration and operation of the education function, the development of students’ observation and thinking skills, training