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2013-05-23 12:21
求翻译：The whole cooling down procedure takes several hours. Therefore a time interval Dt of 1 min is used as resolution. The resulting temperature dependent U-value is plotted for14 different collector tubes against the mean fluid temperature Tf in Fig. 5.是什么意思？ 待解决
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The whole cooling down procedure takes several hours. Therefore a time interval Dt of 1 min is used as resolution. The resulting temperature dependent U-value is plotted for14 different collector tubes against the mean fluid temperature Tf in Fig. 5.
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