document.write("<div class=\"pinglun\"><div class=\"c_1\">网友：110.72.244.*&nbsp;发布于：2010-02-02 01:23:55 &nbsp;评分：<img src=\"/images/comment/star.gif\" alt=\"\" /><img src=\"/images/comment/star.gif\" alt=\"\" /><img src=\"/images/comment/star.gif\" alt=\"\" />&nbsp;<a href=\"#content\" onclick=\"reply('/',6379);\" title=\"引用回复该篇评论\">回复</a>&nbsp;</div><div class=\"c_2\">“那么卫星寿命的一个瓶颈是什么？是动力（现在卫星都用太阳能电池提供动力）。如果动力的寿命到了，卫星就会由于无法克服地球的引力而最终掉下来。”楼主说外行话了，卫星通过调姿、调轨来“克服地球引力”，是靠喷气发动机，而不是由电源提供动力。</div></div><div class=\"pinglun\"><div class=\"c_1\">网友：<a href=\"/member/member.php?username=学与思\" title=\"查看该用户资料\" >学与思</a> &nbsp;发布于：2010-02-01 11:17:27 &nbsp;评分：<img src=\"/images/comment/star.gif\" alt=\"\" /><img src=\"/images/comment/star.gif\" alt=\"\" /><img src=\"/images/comment/star.gif\" alt=\"\" />&nbsp;<a href=\"#content\" onclick=\"reply('/',6371);\" title=\"引用回复该篇评论\">回复</a>&nbsp;</div><div class=\"c_2\">好文！<br /><br />收藏。</div></div><link href=\"/images/comment/style.css\" 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