Therefrom , this thesis puts forward the shock model with seven individually independent sources and structure three - dimensional exponential distribution , which its edge distribution is only bivariate distribution of marshall - olkin 由此,本文提出七個(gè)相互獨(dú)立沖擊源的沖擊模型,構(gòu)造了三維指數(shù)分布,并且它的二維邊緣分布恰是marshall - olkin二維指數(shù)分布。