Your fluency in English gives you an advantage( )for the job.over

Your fluency in English gives you an advantage( )for the job.over

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Things are usually cheaper if they are bought( )bulk.in

Things are usually cheaper if they are bought( )bulk.in

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A bridge can be defined( )a structure getting over an obstacle,such as a river,a

A bridge can be defined( )a structure getting over an obstacle,such as a river,a road or railways.as

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设某种元件的使用寿命T的分布函数为:,其中θ,m为参数且大于零。(Ⅰ)求概率P{T>t}与P{T>s+t|T>s},其中s>0,t>0;(Ⅱ)任取n个这个元件做

设某种元件的使用寿命T的分布函数为:,其中θ,m为参数且大于零。(Ⅰ)求概率P{T>t}与P{T>s+t|T>s},其中s>0,t>0;(Ⅱ)任取n个这个元件做寿命试验,测得它们的寿命分别为t1,t2

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设随机变量X的概率密度为对X进行独立重复的观测,直到第2个大于3的观测值出现时停止,记Y为观测次数。(Ⅰ)求Y的概率分布;(Ⅱ)求E(Y)。

设随机变量X的概率密度为对X进行独立重复的观测,直到第2个大于3的观测值出现时停止,记Y为观测次数。(Ⅰ)求Y的概率分布;(Ⅱ)求E(Y)。

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