案例描述:《马铃薯在水中是沉还是浮》一课教学中,老师把大小两个马铃薯分别放在含和不含盐水的玻璃容器中,然后相互交换放置,学生根据产生的现象进行思考和推测,学生作出初步的判断,如下:准备将大马铃薯放入1号玻璃容器中,小的放入2号中,问:沉浮情况可能会怎么样?学生猜测:学生1:大的浮,大的马铃薯体积大,当然 Case Description: “Potato in the water is sinking or floating,” the teaching of a teacher, the size of the two potatoes were placed in glass containers with and without saltwater, and then placed in exchange for each other, students think and presumably based on the phenomenon , Students make a preliminary judgment, as follows: Prepare the potato into the No. 1 glass container, a small into the No. 2, asked: ups and downs may be what? Students guess: Students 1: large floating, large The potatoes are large and of course