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设(T<sub>11</sub>,T<sub>21</sub>),…,(T<sub>1n</sub>,T<sub>2n</sub>)和(Y<sub>11</sub>,Y<sub>21</sub>),…,(Y<sub>1n</sub>,Y<sub>2n</sub>)都是i.i.d.的非负r.v.F(s,t)=P(T&l