短語詞組短語First -order Second-moment Method 一次二堦矩法first -order second-moment theory 一次二堦矩理論mean value first -order second-moment method 均值一次二堦矩方法advanced first -order second-moment method 改進的一次二堦矩法adapted first -order second-moment method 改進的一次二堦矩法simplified first -order second-moment m ethod 簡化一次二堦矩法the first -order second-power moment 一次二堦矩ameliorative first -order second-moment method 改進一次二堦矩法 返回 first-order second-moment