2010年1月17日在西昌卫星�射中心成功�射了第三颗北斗导航卫星.该卫星在�射过程中经过四次变轨进入同步轨道.第四次变轨示意过程如图所示 Template




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tomski2010年1月17日在西昌卫星�射中心成功�射了第三颗北斗导航卫星.该卫星在�射过程中经过四次变轨进入同步轨道.第四次变轨示意过程如图所示 coloring