Passenger volume forecast is an important foundation for launching mass railway transit construction projects.
客流预测是轨道交通建设项目决策的重要依据。
A quadrupole mass spectrometer used during launch vehicle testing and launching is given, and the trend of spacecraft leak monitoring technique and equipment is raised.
文中给出了四极质谱计在火箭试验及发射时的应用实例，并提出航天器泄漏监测技术的发展趋势和监测设备的方向。
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。
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