《磁铁的性质》□海城响堂荒岭小学于荣娟再让学生根据自己的经验说一说，要使一定量的高锰酸钾在一定量的水里尽快溶解，应该怎么办？由教师提出问题，让学生作出假设。其目的是为了导出新课，完成教学模式中的前两步。导语是：刚才，同学们说了很多加快溶解的方法，这些... “The nature of magnet” □ Halong Primary School, Haicheng Ringo Yu Rongjuan Let students according to their own experience to say that to make a certain amount of potassium permanganate dissolved in a certain amount of water as soon as possible, what should I do? Ask questions from teachers and ask students to make assumptions. Its purpose is to export a new lesson and complete the first two steps in the teaching model. Lead is: just now, the students said a lot of ways to speed up the dissolution of these ...