□□据2006年2月15日美国《每日防务》报道,美国空军科学咨询委员会(AFSAB)发布了“在近太空高度持久执行任务”(Persistence at Near Space Altitudes)研究项目的报告,提出了美国空军近期(到2010年)、中期(到2020年)和远期(2020年以后)近太空飞行器的发展和选择建议。该报告认 □ According to a report by the U.S. Daily Defense on February 15, 2006, the U.S. Air Force Scientific Advisory Committee (AFSAB) released a report on the research project “Persistent at Near Space Altitudes” The U.S. Air Force’s near-future (2010), mid-term (2020) and long-term (2020) development and selection recommendations for spacecraft. The report acknowledged