College Physics ›› 2021, Vol. 40 ›› Issue (2): 32-35.doi: 10.16854 /j.cnki.1000-0712.200070
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1. College of Physics,Chongqing University,National Demonstration Center for Experimental Physics Education,Chongqing 401331,China; 2.College of Aeronautics and Astronautics,Chongqing University,Chongqing 401331,China