18.要�射一颗人造地球卫星使它在半径为r2的预定轨道上绕地球做匀速圆�运动为此先将卫星�射到半径为r1的�地暂行轨道上绕地球做匀速圆� Template




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tomski18.要�射一颗人造地球卫星使它在半径为r2的预定轨道上绕地球做匀速圆�运动为此先将卫星�射到半径为r1的�地暂行轨道上绕地球做匀速圆� coloring