设随机变量X与Y独立,且分别服从正态分布N(0,1)和N(1,1)则()A、P(X+Y≤0)=1/2

设随机变量X与Y独立,且分别服从正态分布N(0,1)和N(1,1)则()A、P(X+Y≤0)=1/2 B、P(X+Y≤1)=1/2 C、P(X-Y≤0)=1/2

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I.ve been walking round town all day and got very

I.ve been walking round town all day and got very , I. m looking forward to a re

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Each of the students, working hard at his or her l

Each of the students, working hard at his or her lssons , to go to university.A.

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9.遵守行文规则是为了( )。 A.确保公文迅速、准确传递 B.避免行文紊乱 C.保障公文旅行D.确

9.遵守行文规则是为了( )。 A.确保公文迅速、准确传递 B.避免行文紊乱 C.保障公文旅行D.确定行文关系 E.控制发文数量

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