The relation between speed of longitudinal waves and spring parameters has been known theoretically and it has been verified by our experiment.
得到了弹簧上纵波传播速度与弹簧参量间的理论关系，并从实验上进行了验证。
2
The Chun Qiu (Spring and Autumn Annals)provides longitudinal material for comparison and collation in the study of the astronomy and calendar of State Lu.