observed heat value的用法和樣例：
例句
- After setting up a small-scale test gasifier and analyzing sampled gases, the heat value of gasified gas is available.
搭建一小型氣化試驗爐，分析採樣氣，得到氣化氣的熱值。 - The calorific value of Medicago populations from northern Xingjiang and cultivars were measured using Parr measurement.
摘要用氧彈式自動測熱儀測定苜蓿不同種群植物體的熱值。
