第一宇宙速度两个别称：航天器最小发射速度、航天器最大运行速度。

The first two speed of the universe another name: the smallest space launch speed, maximum speed of the spacecraft.

youdao

第一宇宙速度两个别称：航天器最小发射速度、航天器最大运行速度。

The first two speed of the universe another name: the smallest space launch speed, maximum speed of the spacecraft.

youdao