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【单选题】
两样本均数的比较，给定α，若δ未知，且样本量不大，假设检验中若用u界值代替t界值，则
A.
否定H0的可能减小
B.
接受H0的可能增大
C.
接受H1的可能减少
D.
犯第二类错误的可能增大
E.
犯第一类错误的可能增大
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