主要讨论对左（右）理想满足半极大条件的环与对零因子满足极大条件的环的性质。
In this pater , the proterties of the rings that satisfs the semi-maximum condition for left (right) ideal and maximum condition for zero-factor are discussed.
本文对带有右截尾数据的有重复因子试验，提出了另一种分析位置效应和散度效应的方法：首先，在每一个试验点，对重复试验观察值用极大似然法估计出均值和方差；
A method is presented for estimating the location and dispersion effects from these experiments. Firstly, we estimate the variance and the mean of each cell with maximum likelihood;
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