计算分数精确值

任何事物都是object类的子类或间接子类

未知题型任何事物都是object类的子类或间接子类

标准正态分布的分布函数为Φ(x)，则Φ(-x)=Φ(x)

未知题型标准正态分布的分布函数为Φ(x)，则Φ(-x)=Φ(x)

Which of the following choices is closest in meaning to...

单项选择题Which of the following choices is closest in meaning to the underlined word in the sentence: At age seventeen, she stepped aside, joined the board, and handed over the reins to two fifteen year olds.