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【单选题】
设随机变量X和Y都服从标准正态分布,则( )。
A.
服从 分布
B.
和 都服从 分布
C.
服从 F 分布
D.
X + Y 服从正态分布
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举一反三
【单选题】Nevertheless, Picasso managed a likeness of his subject.
A.
Nevertheless, Picasso managed a resemblance to his subject.
B.
Despite this, Picasso made the subject of his painting likeable.
C.
Despite this, Picasso's subject could be reconstructed from the image he created.
D.
Nonetheless, Picasso's subject remained similar to others he had painted.
【单选题】已知 为等比数列 的前 项和, ,若数列 也是等比数列,则 等于                                                               (   )
A.
B.
C.
【单选题】若等比数列 中, ,若 , ,则 等于(  )
A.
16
B.
27
C.
36
D.
82
【多选题】Picasso and his paintings can be evaluated asfollows:_______________.
A.
Picasso is one of the representatives of realism in western art history.
B.
Picasso is famous for his Cubist painting.
C.
Picasso’s painting is abstract for us to understand.
D.
Picasso’s paintings are unacceptable by the art circle.
E.
Picasso and his paintings are quite influential and well-accepted.
【简答题】等比数列 的前n项和为 ,若 ,则 等于 。
【多选题】下列属于我国公民基本义务的有
A.
维护国家统一和全国各民族团结
B.
遵守宪法和法律
C.
维护祖国的安全、荣誉和利益
D.
保卫祖国、依法服兵役和参加民兵组织
E.
依法纳税等其他义务
【多选题】下列属于我国公民基本义务的是
A.
保卫国家、抵抗侵略
B.
维护国家统一和民族团结
C.
维护祖国安全、荣誉和利益
D.
依法纳税
E.
科学研究、文艺创作
【单选题】等比数列 ,若 ,则 等于                 ( )
A.
4
B.
-4
C.
【简答题】若等比数列 的首项为 ,且 ,则公比等于 。
【简答题】各项均为正数的等比数列 的前 项和为 ,若 , ,则 等于 .
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