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作者将需产生低温状态的有关试验归纳为五类,逐一介绍其不同要求。提出选择制冷方式的五个基本原则。介绍美国有关制冷方式的应用情况以及几个阶段制冷方式的变革。
The author will need to produce low-temperature state of the relevant tests into five categories, one by one to introduce their different requirements. Put forward the five basic principles of choice of refrigeration. Describes the application of the refrigeration system in the United States and changes in the refrigeration system in several stages.