第一宇宙速度是最小�射速度,那是按照地表算的,假设在高山上�射,�射速度不是小于这个速度? 知乎 Template




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tomski第一宇宙速度是最小�射速度,那是按照地表算的,假设在高山上�射,�射速度不是小于这个速度? 知乎 coloring