Celestia教学活动之七幻灯片

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\centerline{\kaishu{\zihao{3}Celestia 的宇宙飞船}}\\[2pt]
\centerline{\kaishu{\zihao{4}地球和月球太空船}}
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\section{开启太空时代}
\subsection{人造卫星}
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从\href{file:///C:/Program Files/Celestia161-ED/Activity_cels/Activity7.vbs}{\beamergotobutton{这里}}开始我们的太空旅行。
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