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The author studies the existence of p-blocks of defect zero and obtains some group-theoretic conditions for it.

本文研究了亏零p-块的存在性,得到一些亏零p-块存在的群论条件。

With the aid of on-the-spot investigation,the principle of runs test and P-P plot are applied to the study of sales income of a supermarket in Kunming.

通过实地调研,应用游程检验和P-P概率图的原理,研究了昆明市某超市销售收入,得出在该超市购物的消费额是服从对数正态分布,并对其均值进行了参数估计。