step-rockets

英[s'tepr'ɒkɪts] 美[s'tepr'ɒkɪts]
  • 多级火箭
  • bar n.酒吧;条;横木;栅vt.禁止;阻挠;闩上;在...设栅栏
  • chart n.图表;规划图;排行榜v.制成图表;绘制地图;规划
  • step n.步骤;台阶;舞步;步伐v.踏;以步测量
名词 step rocket:
  1. a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted