In 1961, NASA has encouraged studies of space-planes that could be built using e

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问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. [br] 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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