现代火箭推进的基本原理源于中国的火箭发明,中国的这项发明产生于?
现代火箭推进的基本原理源于中国的火箭发明,中国的这项发明产生于?
A汉朝B唐朝C元朝D明朝
A汉朝B唐朝C元朝D明朝
历史人气:577 ℃时间:2020-03-21 04:31:59
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