URL:https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUDicIbCV4JHGlaxpBEGue72ZOU2tYXUIl50YMrYi-Ff9NWnsmlvpUMkrcQOA0ZJeABMVn1VgN2mne7GVYJ0ubG3-e4BH04KpC-L4Ehw4D_QeqG8GCpS2YsCm7-g0RlyFADXPei0_qJbU/w1200-h630-p-k-no-nu/3.jpeg
掲載元:https://cikguwong.blogspot.com/2010/06/physics-form-5-chapter-4-cathode-ray.html