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知道了分部混凝土试块平均强度、均方差和组数,要计算全部混凝土试块强度均方差,可利用以下公式计算,大大减少工作量。■式中:a_Ri=
Knowing the average strength, mean square error, and number of groups of the concrete test blocks of the sub-divisions, to calculate the variance of the strength of the entire concrete test blocks, the following formula can be used to calculate the work volume. ■ In the formula: a_Ri=