The methods of how to reasonably select electricity net operating mode, fault points and type, and how to reduce the calculation amount of minimum auxiliary increasing coefficient are provided.
The paper proposes new separate ratio estimators for population mean using known skewness coefficient of auxiliary variable in stratified random sampling.
本文在分层随机抽样下通过使用辅助变量的偏斜系数提出了几个总体均值的估计。
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The key to design an auxiliary impeller seal is to determine the opposite pressure coefficient k.