- activityn. 活动；行动；活跃 economic activity 经济活动
catalytic activity 催化活性
physical activity 身体活动，体育活动；体力活动
- catalyticadj. 接触反应的副 词: catalytically
catalytic cracking 催化裂化
catalytic activity 催化活性
catalytic
- kataln. 开特（催化活性单位）
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