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【简答题】
设随机变量X与Y相互独立，且有方差D(X)与D(Y)，求证： D(XY)=D(X)D(Y)+[E(Y)] 2 D(X)+[E(X)] 2 D(Y)
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举一反三
【简答题】I always love ________________.
【单选题】I always love having lunch at that restaurant because ______ is beautiful.
A.
a furniture is
B.
the furnitures
C.
the pieces of furnitures
D.
the furniture
【单选题】电影《保镖》(The Bodyguard) 的主题曲“I Will Always Love You”中 “Bitter sweet memories, that is......” I Will Always Love You.mp4
A.
Hyperbole
B.
Oxymoron
C.
Overstatement
D.
Understatement
【单选题】. I love fruit. I always carry apples or bananas in my bag in case I get hungry.
A.
a little
B.
a few
【简答题】I will always love you.
【简答题】螺纹切削指令是
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