现行人教版高中物理教材必修2课本实验“研究平抛运动”中,编者提供了几种实验参考案例,其中一种如图1装置,在实际操作中存在两点不足:(1)由于瓶口向下,实验操作过程中需要借助其他装置(如铁架台)来固定瓶子,不太方便;(2)在调节C处管口方向,让出水初速度水平时,往往要让瓶子和? Current PEP version of high school physics textbook compulsory 2 textbook experiment “study flat cast motion”, the editor provides several experimental reference case, one of the devices in Figure 1, in practice there are two deficiencies: (1) As the bottle Mouth down, the experimental operation requires the use of other devices (such as iron stand) to fix the bottle, not easy; (2) in the regulation of C nozzle direction, so that the initial velocity of the water often make the bottle and?