新编三年制中师物理教材,能突出中师特点,密切联系小学实际,特别是书中编排的观察与思考、小实验、小制作、小资料和阅读材料等更受学生欢迎。本文就中师物理下册“电视”一节中内容提出几点补充说明。一、关于视觉暂留问题电视是利用无线电技术来传送静止或活 The new three-year system of physics textbooks for middle school students can highlight the characteristics of the central teachers and closely link with the actual conditions of primary schools. In particular, the observations, reflections, small experiments, small productions, small materials, and reading materials in the books are more popular with students. In this paper, several supplementary explanations are given on the content of the section entitled “TV” in the second book of Normal University Physics. I. About vision persistence TV uses radio technology to transmit static or live