序言目前,世界各国使用的运载火箭有十多个系列,其中有些系列是按照某种特殊任务要求研制的,而多数是由五十年代末和六十年代初研制的中程和洲际液体导弹衍生来的。许多火箭经过一系列应用发射和改进后已经成了标准化和系列化的火箭。它们的有效载荷能力有了成 Preamble At present, there are more than a dozen series of launch vehicles used in various countries of the world, some of which were developed according to a special mission requirement, most of which were derived from mid-range and intercontinental liquid missiles developed in the late 1950s and early 1960s Come on. Many rockets have become standard and serialized rockets after a series of launch and improvements. Their payload capacity has become