The investigations in this paper provide the reference to development gaseous nitrogen recycling unit in the large space environmental simulation system in our country.
计算出它们的较佳运行参数，分析和比较了两个方案的技术性和经济性，为我国空间环境模拟设备冷氮气回收系统研制提供了有益的参考。
The integrated simulation of urban drainage system is a prevailing method to estimate its water environmental impact, however, there have not been any related studies in China.
城市排水系统的集成化模拟是国际上推行的一种研究方法，但在我国尚没有相关的实例报道。
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