1.测量结果的不确定度一般包含几个分量。按其数值的评定方法,这些分量可归入两类: A类:用统计方法计算的那些分量, B类:用其它方法计算的那些分量。对于不确定度的分类,A类和B类与以前的“偶然”和“系统”不一定存在简单的对应关系。“系统不确定度”这个术语可以引起误解,应僻免使用。 1. The uncertainty of the measurement results generally contain several components. According to the method of evaluating their value, these components fall into two categories: A categories: those calculated by statistical methods, and B categories: those calculated by other methods. For the classification of uncertainty, there is not necessarily a simple correspondence between categories A and B and the previous “chance” and “system.” The term “system uncertainty” can cause misunderstandings and should be used indefinitely.