论述了大气混合层厚度的多种计算方法如国标法、干绝热法、罗氏法等，并分析了大气混合层厚度的各种影响因子。

Several calculation methods of the thickness of atmospheric mixed layer, such as national standards method, dry adiabatic method, Nozaki method, were studied in this paper.

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本提取方法与国标法的酸水解法（GB5009。 6-85）和哥特里-罗紫法（GB/T5009.46-1996）比较，DHA的提取率提高了10%以上，本提取方法的回收率为97.0%-98.3%，且具有操作简便、不易出现乳化等优点。

The rate of DHA extraction by this method was 10% more than that by the methods of GB5009.6-85 and GB/T5009.46-1996. The recovery was 97.0% - 98.3% . Meanwhile, this method is simple and accurate.

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