在给定有效载荷、最高射高的条件下，选取动力系统的设计参数使火箭的起飞质量最小。
Under the conditions of the given payload and the highest launching height, the design parameters of the propulsion system are selected to minimize takeoff mass of the rocket.
在给定有效载荷、最高射高的条件下，选取动力系统的设计参数使火箭的起飞质量最小。
Under the conditions of the given payload and the highest launching height, the design parameters of the propulsion system are selected to minimize takeoff mass of the rocket.
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