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美国政府要求美国航天工业制定飞行M8的高超音速军用和民用航天飞机计划,到本世纪末研制出单级入轨跨大气层的飞行器.
The U.S. government requires the U.S. aerospace industry to plan a hypehonic military and civilian space flight for the M8 and to develop a single-stage orbiting orbiting aircraft by the turn of the century.