Isaacman also said the agency would halt work to develop a more powerful version of the SLS rocket's upper stage, known as the Exploration Upper Stage, or EUS. Instead, NASA will go forward with a "standardized," less powerful stage but one that will minimize major changes between flights and utilize the same launch gantry.
Author(s): Shuang Shan, Longfei Guo, Chongyang Wang, Zhen Li, Xinjie Wu, Haibin Wei, Fuyi Chen，详情可参考搜狗输入法下载
on the tool may lead to a lack of understanding of the code.，推荐阅读同城约会获取更多信息
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