The mean calorific value of methane sampled from 4 cylinders is determined to be 39839 kJ/m3 with a total uncertainty of 0.2% and which is in agreement with the value issued by ISO within 0.1%.

对四个钢瓶高纯甲烷的热值进行了测定并考察了稳定性，总不确定度为0.2％，与ISO公布的甲烷热值在0.1％以内一致。

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Making use of the cause and effect diagram to analyse the sources and influences of uncertainty in determination of total hardness in water by EDTA titrimetric method was introduced.

采用直观的因果图，对EDTA滴定法测定水中总硬度的不确定度的来源及其对测量不确定度的影响进行分析。

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The most serious problems are total measurement uncertainty, CMP process robustness, and device correlation.

最严重的问题是总的测量方法不确定、CMP工艺的坚固性以及器件的相互关系。

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The uncertainty led to total product stagnation, which for engineering and product management was very frustrating.

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