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Returns the variance of a numeric expression evaluated over a set ( unbiased ).
返回在某一集合上对数值表达式求得的方差 ( 非偏置填充 ).
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Adds the value of one numeric expression to another or concatenates two strings.
将数值表达式的值与另一数值表达式相加,或连接两个字符串.
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Returns the variance of a numeric expression evaluated over a set, using an unbiased population.
返回在某一集合上对数值表达式求得的方差(使用非偏置填充).
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- XXIX num.罗马数字 29;
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