题目内容 (请给出正确答案)
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请教:标准物质的定义是什么?请教专家解释

【题目描述】

用对观测列进行统计分析的方法,来评定标准不确定度,称为( )。A.不确定度的A类评定

B.不确定度的B类评定

C.合成标准不确定度

D.标准不确定度

【我提交的答案】: A
【参考答案与解析】:

正确答案:A

答案分析:

解析:概念性选择题,考查不确定度这一知识点(常考知识点)。标准不确定度是指以标准(偏)差表示的测量不确定度。用对观测列进行统计分析的方法来评定标准不确定度,称为不确定度的A类评定;用不同于对观测列进行统计分析的方法来评定标准不确定度,称为不确定度的B类评定;当测量结果是由若干个其他量的值求得时,按其他各量的方差和协方差算得的标准不确定度,称为合成标准不确定度。所以选A。

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