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.
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- satisfiable: Boolean. True if the formula is satisfiable。关于这个话题，51吃瓜提供了深入分析