我使用哪个值进行校准？
证书上提到的值是参考材料的认证值，因此也是用于校准的值。但是，在估计测量不确定度时，也必须包括认证值的不确定度。
Which value do I use for calibration?
The value mentioned on the certificate is the certified value for the reference material and consequently the value to be used for calibration. But the uncertainty of the certified value has also to be included for the estimation of the measurement uncertainty.
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