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【单选题】
Why does the author introduce Abstract Expressionist painter?
A.
He wants to provide an example of artists who, like serious contemporary photographers, disavowed traditionally accepted aims of modern art.
B.
He wants to set forth an analogy between the Abstract Expressionist painters and classical Modernist painters.
C.
He wants to provide a contrast to Pop artist and others.
D.
He wants to provide an explanation of why serious photography, like other contemporary visual forms, is not and should not pretend to be an art.
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【单选题】在藻类生活史中,核相交替与世代交替关系不正确的是
A.
没有有核相交替就一定没有世代交替
B.
有世代交替就一定有核相交替
C.
有核相交替不一定有世代交替
D.
有核相交替就一定有世代交替
【多选题】在藻类植物生活史中,核相交替与世代交替的关系正确的是(    )。
A.
有核相交替就一定有世代交替    
B.
有世代交替就一定有核相交替
C.
有核相交替不一定有世代交替    
D.
没有核相交替就一定没有世代交替
【判断题】小样本情况下,总体服从正态分布,总体方差已知,总体均值在置信水平( 1-α)下的置信区间为
A.
正确
B.
错误
【单选题】在藻类植物的生活史中,核相交替与世代交替的关系不正确的是( )。
A.
有核相交替就一定有世代交替
B.
有世代交替就一定有核相交替
C.
有核相交替不一定有世代交替
D.
没有核相交替就一定没有世代交替
【多选题】Which of the following statements is/are correct about vowels?
A.
Vowels are produced without significant constriction of the air flowing through the mouth.
B.
There are 28 vowel sounds in English.
C.
Vowels refer to the sounds in spoken language that are made with no obstruction of air flow in the mouth.
D.
All vowels are voiced.
【简答题】小样本情况下,总体服从正态分布,总体方差已知,总体均值在置信水平(1-α)下的置信区间为( )
【简答题】大样本情况下,总体服从正态分布,总体方差已知,总体均值在置信水平(1-α)下的置信区间为( )
【判断题】The long vowels are all tense vowels and the short vowels are lax vowels.
A.
正确
B.
错误
【单选题】在参数估计中利用t分布构造总体均值置信区间的条件是( )。
A.
总体服从正态分布且方差已知
B.
总体为正态分布,方差未知
C.
总体不一定是正态分布但必须是大样本
D.
总体不一定是正态分布,但需要方差已知
【简答题】The long vowels are all tense vowels and the short vowels are l______ vowels.
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