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【简答题】
设X1,X2,...Xn是来自正态总体X~N(μ,σ^2）的简单随机样本 求（X1+X2+...+Xn）服从什么分布? 正态么?期望,方差都是多少?
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举一反三
【简答题】The key to _________ laws lies in devotion and responsibility of the staff concerned. A：enriching B：enrolling C：enlarging D：enforcing
【简答题】The key to _________ laws lies in在于 devotion忠诚，现身 and responsibility of the staff concerned. A：enriching B：enrolling C：enlarging D：enforcing
【单选题】Li Feng’s __________ of devotion to others will be remembered not only in China but also in some other parts of the world.
A.
achievement
B.
service
C.
thought
D.
spirit
【简答题】苹果公司开发的视频格式是 _______
【简答题】下列不属于正治法的范畴的是( )。A.寒者热之B.热者寒之C.用寒远寒D.热因热用A. 1 B. 1 C. 1 D. 1
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