并对影响城市空气质量的5个主要因素进行主成分分析，找出最能代表原来数据信息的2至3个因子代替原来的5个变量。
Then 5 main factors affecting urban air quality to principal component analysis identify the most representative of the original data instead of the 2 to 3 factors 5 variables.
目的通过对11类健康相关因子的负性发生率及其影响因素的试点研究，综合评估炼油企业职工的健康需求。
Objective to evaluate health requirements of workers in oil refinery enterprise comprehensively by the test site study on 11 sorts of negative health correlation factors and their affecting factors.
目的确定影响道路人工清扫过程扬尘大小的因素之间关系及排放因子量化模型。
Aim to analyze the relations of factors affecting the fugitive dust during road sweeping and bring up calculative models of discharging divisors.
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