closed end
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将其测试结果与模拟试验结果进行了比较，为闭式循环4.4K制冷机的第一级主换热器的热端温差的合理选取提供了依据。
The basis for selecting the reasonable temperature difference at the hot end of the first main heat exchanger of close-cycle 4.4K refrigerator is provided.
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