文中给出了二级脉管制冷机的基本结构尺寸以及试验结果：一级脉管达到45K；
The test results and the basic configuration of the two stage pulse tube refrigerator are presented. The first stage temperature was 45K.
对比两套不同尺寸的脉管制冷机的实验结果，详细分析其不同点，并提出具体的制冷机改进方案。
By comparison, the difference of experimental results of two groups of pulse tube refrigerators has been analyzed and an improved experimental scheme has been brought forward detailedly.
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