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在日常生活和生产中 ,我们常常见到管道需要作直角形转弯 .管子弯头 ,就是今天我们要研究的问题 .问题 1 如何由一根管子做成一个直角形状的接口 ?教师首先让每个学生小组 (4人一小组 )拿出准备好的粗一些的硬纸管 ,并思考上述问题 1 .各小组学生经过几分钟探讨后 ,提出如下观
In daily life and production, we often find that pipes need to make a right-angled turn. The pipe elbow is the problem that we want to study today. Question 1 How to make a right-angle shaped interface from a pipe? The teacher first makes every A group of students (a group of 4 people) took out the rough cardboard tubes prepared and thought about the above issues. 1. After several minutes of discussion, the students in each group proposed the following: