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In 1961, NASA has encouraged studies of space-planes that could be built using e
In 1961, NASA has encouraged studies of space-planes that could be built using e
游客
2023-09-17
16
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问题
In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. [br] The main difficulties of space flight are neither______ nor______.
选项
答案
technical,commercial
解析
第2段的第l句可以找到答案,要实现这一梦想并不是技术和商业上的问题。
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