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。
By measuring the coordinate positions of a series of fixed targets from several instrument locations and calculating the measurement results, the working uncertainty of the total system will be given.
通过移站测量来获得几个固定点的坐标位置，然后将测量结果进行处理，给出整个测量系统的测量不确定度。
The presented evaluation method may provide a reference for evaluating the uncertainty about the total leak rate method of spacecraft and vacuum leak testing method.
该评价方法可以为航天器的总漏率测试法和真空检漏法的不确定度评定提供一定的参考依据。
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