A logarithm mathematical model is used to analyze 702 CVN impact test data and by means of regression, a general equation is obtained for bridge steel and welding seams.
对702个CVN冲击试验数据应用对数数学分析模型进行回归，得到桥梁钢和焊缝的通用计算表达式。
The standard logarithm visual acuity chart is applicable to general physical examination, enrollment and recruitment and it can also be referred to in clinical research.
标准的视力表箱适用于一般体检，招生、招工等视力测定，临床方面也可参照使用。
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