问题
选择题
My birthday is ____________.[ ]
A. July twenty-fifth
B. July twenty-five
C. July twenty-fiveth
答案
答案：A
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My birthday is ____________.[ ]
A. July twenty-fifth
B. July twenty-five
C. July twenty-fiveth
答案：A
等于(结果用标准正态分布函数Φ(x)表示)
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