设随机变量序列X1,X2,···,xn,···相互独立同分布,均服从参数为1的泊松分布,-|||-则当n→∞时, dfrac (1)(n)sum _(i=1)^n(x)_(i)((X)_(i)-1) 依概率收敛于 ()-|||-(4分)-|||-A 2-|||-B 1-|||-C 3-|||-(D dfrac (1)(2)