contraposition

In fact,it is possible to exert conversion on O-proposition in conversion by contraposition inference which takes the premise by the universal proposition.

本文通过欧拉图我们可以证明以全称命题为前提的换质位法推理中O命题是能够换位的。

Fundamental theory and design method of mass exchange networks were systematically reviewed.

首先综述了换质网络综合技术的设计方法与理论基础 ,即夹点设计法与数学规划法。

And the measure of quality of energy transformation in heat exchnger has been discussed.

导出了换热器流体有限温差传热过程引起的熵产无因次表达式,并给出了顺、逆流换热器在NTU>NTU条件下,N_s随NTU不同变化规律的合理解释,提出了换热器能量转换质量的一种判别准则并进行了分析。