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现行高中物理教材导出第一宇宙速度后,又简介了第二宇宙速度和第三宇宙速度。这些知识与当代宇航问题相联系,学生很感兴趣,课外常问我:“第二宇宙速度和第三宇宙速度是怎样导
After the current high school physics textbooks exported the first cosmic velocity, they introduced the second cosmic velocity and the third cosmic velocity. This knowledge is linked to contemporary aerospace issues. Students are very interested. Extracurricular questions often ask me: "How do the second cosmic velocity and the third cosmic velocity guide?