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。
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。
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%.
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