Secondly, the enthalpy of elementarysubstance under standard state is defined as the criterion of component enthalpy, thus reaction heat is no longer needed in energy balance.
其次，热量衡算时，将标准状态下单质的焓定义为所有组分的基准焓，不再需要反应热数据。
3
The skills are the most elementary and important instrument which re-create the charm of vocal music which existed in the form of substance.