Jahn exercises

Research on Yangshi Gymnastics and Its Significance;

对杨氏体操及其影响的探究

An experimental method of improving the measuring of metal Young modulus using a semi-conductor laser is introduced.

本文介绍了一种用半导体激光器改进测金属扬氏模量实验的方法，提高了测量精度，简化了操作过程，节省了实验装置。