二、一次性运载火箭的发展趋势尽管实现可重复使用是航天运载器技术发展的目标，以美国为首的一些航天发达国家也在通过一系列计划推动这一目标的早日实现，但由于可重复使用运载器技术难度大，牵涉的关键技术多，所以近期还无法取代一次性运载火箭。在今后相当长的一段时间内 Second, the development trend of disposable rocket Although the realization of reusable spacecraft technology development goals, the United States headed by some of the space-developed countries are also through a series of plans to promote the early realization of this goal, but because of reusable Carrier technology is very difficult, involving many key technologies, so the recent can not replace the one-time launch vehicle. In the future for a long period of time