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中国自行研发的“长征3号乙”运载火箭，上周六（20日）晚上10时41分，在四川西昌卫星发射中心成功发射，将第44颗“北斗”导航卫星送入预定轨道。这次不但是“北斗”导航卫星今年首次发射，也是“长征”系列运载火箭中首个达到发射100次的单一系列火箭。

这次发射的卫星，是“北斗3号”系统第20颗组网卫星。它将与此前发射的18颗中圆地球轨道卫星和1颗地球同步轨道卫星组网。

今年计划发射8至10颗“北斗3号”卫星，“北斗”系统是目前全球唯一利用3种不同类型轨道卫星的混合星座设计，可为亚太地区提供更优质服务。

“长征3号甲”系列包括“长征3号甲”、“长征3号乙”、“长征3号丙”3种火箭，自1994年2月8日首次完成首务以来，已执行36次“北斗”工程发射任务，其中12次是以一箭双星方式发射。这系列火箭是在“长征3号”发射成功后研制的3级大型运载火箭。

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