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In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. In April 1995, makes the___
In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. In April 1995, makes the___
admin
2009-04-23
54
问题
In 1961, NASA has encouraged studies of space-planes that could be built using existing technology.
In April 1995, makes the______.
选项
答案
unpiloted single-stage-to-orbit launcher
解析
文章第6段的最后1句,1995年4月,所签署的具有竞争力和研究性的合同,制造出了一种无人驾驶的单级轨道的运载火箭。
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0
大学英语六级
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