看似复杂的发明往往源于简单的原理。关于动力臂与阻力臂的换算是初中学习的内容,压式提水机是农村中经常见到的取水装置,在经过细致观察和原理分析之后,发明者把它们运用到省力打气筒的创造之中。只是这期的发明有些细节问题还没有进行处理,比如适合轮椅人士使用的打气筒的科学高度是多少?下压的压力应该有多大才能既省力又快速打气?尽管还有不足,这仍是一件值得鼓励的作品。 Seemingly complex invention often stems from the simple principle. About power arm and resistance arm conversion is the content of junior high school learning, pressure type water pump is often seen in rural areas of the water device, after careful observation and analysis of the principle, the inventors apply them to the effort to create a pump in. Just some of the details of the invention of this issue has not yet been addressed, such as suitable for wheelchair use of the scientific height of the pump is how much pressure on the pressure should be how much effort to both effort and cheer? Although there are deficiencies, it is still a Pieces worth encouraging