The major factors effecting on the backpressure include atmospheric environment temperature, primary temperature difference of air-cooling, end difference of condensers.
影响其背压的主要因素有：大气环境温度、空冷初始温差、凝汽器的端差。
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.
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。
It is found that, with the rising of rolling speed, the temperature of finished product is raised greatly, and the temperature difference between head and end of the product is reduced apparently.
随着轧制速度的提高，成品终轧温度明显升高，头尾温差大幅度减小；
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