the overall temperature difference
整体温差
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The variation of heat loss rate with the vacuum degree, the effect of vacuum degree on the heat loss, the variation of overall heat loss coefficient with the temperature difference are found.
得出了热损速率随真空度的变化规律和总热损系数随温差的变化关系。
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