selectivity ratio的意思|示意

The result showed proper reaction temperature, catalyst to oil ratio and short reaction time may detriment thermal cracking reaction, hydrogen transfer reactions, and get high propylene selectivity.

结果表明：适当的反应温度，剂油比，反应时间短，可能损害的热裂化反应，氢转移反应，并获得高的丙烯选择性。

We also studied the reaction conditions which influence on the conversion ratio, selectivity and yield.

研究了反应条件对转化率、选择性和收率的影响。

The effects of temperature, the ratio of ammonia, the ratio of air and the space velocity of catalyst upon the conversion, molar yield and selectivity of the reaction were observed, respectively.

考察了反应温度、氨比、空气比和空速对反应的转化率，摩尔收率和选择性的影响。