We can imagine a spacecraft carrying a big area of him film to collect solar energy,with an ion-jet engine to produce thrust powerful enough to boost a spacecraft to a speed of 160 km a second.

 
  • 我們可以設想一艘航天器,它裝載著(zhù)收集太陽(yáng)能的巨大薄膜,并載有一個(gè)能產(chǎn)生強大推力足以使航天器加速到每秒160公里的離子噴氣發(fā)動(dòng)機。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan