塑料喷水壶是家居生活用于浇花草的常用工具，其工作原理与农用喷雾器相同，但体积和重量均比前者小巧轻便。在打足气后，水雾或水流能较稳定地持续较长时间，故除了可用于讲述气体性质应用的习题外，还能用于课堂演示教学。a．显示抛体运动的径迹。教材中以小球作平抛运动为例 Plastic spray bottle is a common tool used for watering flowers at home. Its working principle is the same as agricultural sprayer, but its volume and weight are both lighter and lighter than the former. After an insufficiency of water, water mist or water flow can last for a relatively long time, so besides the exercises that can be used to describe the application of gas properties, it can also be used for classroom demonstration teaching. a. The track showing the motion of the projectile. The example of using small balls as flat throwing exercises in teaching materials