开展低成本运载火箭、新型上面级、天地往返可重复使用运输系统等技术研究。
China will conduct research into the technologies for low-cost launch vehicles, new upper stage and the reusable space transportation system between the earth and low-earth orbit.
CZ - 2c是适用于发射低轨道、质量较大卫星的二级液体运载火箭。
CZ-2C is a two-stage liquid propellant launch vehicle, which is suitable for launching heavier LEO satellite.
完成了有效载荷发送任务之后的运载火箭末级是最具有威胁性的空间碎片源。
The upper stage of a launch vehicle accomplishing its mission becomes a serious source of space debris.
介绍了某型号运载火箭二级燃料箱后底顶盖成形方法改进及工艺试验过程。
The paper introduces the shaping method improvement and technological trial course of bottom cap of certain model of carrier rocket's fuel tank.
以液氧加注控制系统为例，介绍液体运载火箭低温推进剂加注控制所采用的两级分布式系统。
The two level distributed control system for cryogenic propellant loading is introduced, taking the Lox loading control system for example.
根据月球研究和行星际飞行任务的需要，为了提高火箭的推重比，要为运载火箭新安装一个第三子级。
Missions for study of the Moon and interplanetary flight required re-equipping the launch vehicle with a third stage to increase its power-mass characteristics.
相反，用在长征九号运载火箭上的级间环，将使用铸造法制造，无需组装，成品即是可直接使用的完整级间环。
In contrast, the ring on the Long March 9 will be made through a casting method that produces it in one piece.
第一级运载火箭是用来发射火箭的，进入高层大气后即抛掉。
The first-stage vehicle is used to launch the rocket and is then jettisoned in the upper atmosphere.
第一级运载火箭是用来发射火箭的，进入高层大气后即抛掉。
The first-stage vehicle is used to launch the rocket and is then jettisoned in the upper atmosphere.
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