央视新闻【我国成功发射实践二十一号卫星】
【转发祝贺！实践二十一号卫星成功发射】今天，我国在西昌卫星发射中心用长征三号乙运载火箭，成功将实践二十一号卫星发射升空。发射任务获得圆满成功！据了解，实践二十一号卫星，主要用于空间碎片减缓技术试验验证。点赞！
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