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In this thesis, a reverse-Brayton cycle air refrigerator was rebuilt. 本文对的小型逆布雷顿循环制冷机试验台进行了部分的改建。
Abstract The basic principle and the actual flow of the reverse-Brayton air Refrigerator have been presented. 摘要本文介绍了逆布雷顿循环空气制冷机的基本原理和实际流程；
A small air refrigerator test rig based on reverse Brayton cycle with foil journal bearings was rebuilt. 本文在原有试验样机的基础上，进行了必要的优化和改进，重新搭建了一套采用逆布雷顿循环，流量为30Nm3/h的小型空气制冷机系统实验台，重新设计了系统各部件：透平膨胀机，换热器和冷箱等。
The air in the garden was warm and fragrant. 花园里的空气一片温馨。
The archers sent their shafts through the air. 弓箭手向空中射出利箭。
In this paper, the theory of reverse-Brayton air Refrigerator has been presented, and the key techniques of air refrigerator have been concerned. 本文介绍了逆布雷顿循环逆布雷顿循环空气制冷机的原理，对其关键技术及相关问题进行了一些探讨。
A small air refrigerator test rig based on reverse Brayton cycle and a cryogenic turboexpander（）with self-acting gas bearings were rebuilt and developed. 本文在原有试验样机的基础上，进行了必要的优化和改进，重新搭建了一套采用逆布雷顿循环，流量为的小型空气制冷机系统实验台，并成功地将全动压气体轴承低温透平膨胀机应用在空气制冷机上。
By increasing isentropic efficiency of compressor and turbo-expander, air refrigeration should increase its energy efficiency and improve its application to air conditioning. 因此，提高它们的绝热效率是使空气制冷在空调领域得以推广应用的关键技术。
A mathematical model of the air refrigerator system is established, including the mathematical models of the turboexpander, the heat exchanger, the cold chamber and the conduit. 建立了空气制冷机系统的数学模型，其中包括透平膨胀机的数学模型，板翅式回冷热交换器的数学模型，低温室的数学模型，管道流动的数学模型。
The lack of air in the room make everyone sniffle. 屋子里空气缺乏，使得每个人都频频吸气。
During the intermission, let's go out for some fresh air. 幕间休息时，我们出去呼吸呼吸新鲜空气吧。
The air held a foretaste of a storm. 天气有要括大风的迹象。
The air was reeking with the smell of tobacco. 空气中弥漫着烟草的气味。
A walk in the fresh air will pep me up. 我在空气新鲜的地方散步就感到精神饱满。
He served one month with the Air Army in Kuwait. 他在科威特的空军里服役1个月。
Large air and navel forces were set into action. 庞大的空军和海军部队开始行动了。
His modesty [air of joviality] was all put on. 他的谦逊[愉快的样子]都是装出来的。
Ida was choking with the dry air. 空气干燥，艾达感到喘不过气来。
His vibrant voice commove the air. 他响亮的声音振动了空气。
Fresh air and exercise are good for the health. 新鲜空气和运动有益于健康。

今日热词

深远海浮式风电平台 - deep-sea floating wind power platform

京雄高速公路 - Beijing-Xiongan expressway

农业及相关产业增加值 - the added value of agriculture and related industries