The principle of photo fixed-focus apparatus, GDDJ - 1, the analysis of precision and the way to improve the precision of the apparatus are discussed.
本文介绍了GDDJ - 1光电定焦仪的工作原理，精度分析以及提高该仪器的精度办法。
Certain sales volume prediction model established on the basis of regression analysis method has higher prediction precision to the types of commodity that closely related to the change of seasons.
运用回归分析方法建立的某类销售量预测模型，对季节变化关联较强的商品的销售量有较高的预测精确度。
In order to improve on the low evaluation precision of the grey relational analysis model, the entropy theory was integrated with the grey relational analysis method to establish a new model.
为了改进灰色关联分析模型评价精度低的缺点，将熵值理论与灰色关联分析方法相结合，建立起基于熵权的灰色关联分析模型。
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