activity and selectivity 活性和选择性的
catalyst activity and selectivity 催化剂的活性和选择性
catalytic activity or selectivity 催化剂活性或选择性
It has been demonstrated that two kinds of catalysts have considerable activity, selectivity and stability.
实验结果表明，两种催化剂具有较好的催化活性、选择性和稳定性。
A successful technical catalyst is required not only to have high activity, selectivity and heat-resistance, but also enough high mechanical strength in order to resist some mechanical stresses.
一种成功的工业催化剂，除具有足够的活性、选择性和耐热性外，还必须具有足够的机械强度，以便抵抗在使用过程中的各种应力。
The lab results showed that the catalyst has good activity, selectivity and stability.
实验室研究结果表明，该催化剂具有良好的活性、选择性和稳定性。
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