介绍气体发动机气耗率和热耗率的基本概念，提出了体积法测量中应注意的问题。
This article introduces the general concepts of gaseous fuel engine gas loss rate and heat loss rate, and puts forward some problems to be paid attention to in volume measurement.
对于像汽轮机热耗率等这样复杂的间接测量问题，采用传统不确定度传递律法进行合成不确定度的评定是很困难的。
This method is used to evaluate the demonstration case in ASME PTC6-1996, the combined standard uncertainty of turbine heat rate obtained is close to results giving in the standard.
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