Under the approximation of second degree the solutions contain linear plane waves.
在二阶近似下，有线性平面波解。
The first method is to subject the cell means to an analysis of variance, the second method uses the individual observations and KENWARDROGER approximation for calculation of degree of freedom.
前者以组平均数为基础进行方差分析，后者以原单个数据为基础并采用KENWARDROGER法确定自由度进行分析。
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