Liquid rocket upper-stage 液体火箭上面级
The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls.
弯月面容器中之静止液体的弯曲上表面,如果液体浸润了容器壁,那么弯曲面呈凹状。
The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls and convex if it does not.
弯月面容器中之静止液体的弯曲上表面,如果液体浸润了容器壁,那么弯曲面呈凹状;如果没有,就呈凸状。
The liquid fuel rocket, which is continually being improved, is used in aircraft as well as for research in the upper air and for putting earth satellites into orbits.
液态燃料火箭不断得到改进,它用在飞行器上,也被用来研究高层大气和把地球卫星送入轨道。
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