探讨了对混合回归模型的混合估计进行简单替代的问题，并给出了由此产生的对估计精度的影响的表达式。
This paper deals with the problem of simple substitution for the mixed estimator of mixed regression model and presents some formulas for its influence on estimator precision.
本文对光源的半宽度在测量某种溶液浓度时对其测量精度的影响进行初步地探讨，并给出一个相应的表达式。
The influence of the semibreadth of light source upon the measurement accuracy of the concentration of the solution is primarily discussed and then a corresponding expression is given in this paper.
然后在不考虑具体测量情况下，得到了整个预警系统的关机点时间估计精度的量化表达式。
Then, not considering the concrete measurement, we present the quantification expression of estimation precision of burnout time.
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