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设对每一正数t, E(t)和A(t)是不相交事件,分别以J<sub>1</sub>(t),J<sub>2</sub>(t),J<sub>2</sub>(t)记E(t)A(t),E(t)UA(t),以J(t,L)记(?)J<sub>l</sub>(t),其中L(?){1,2,3}。如果对任意的0【t<sub>1</sub>【…【t<sub>i+g</sub>,都有P