这段话怎么翻译!!? The long-term trends of these thermocouples are used to monitor the activity characteristics and aging of the catalyst. The fraction of the catalyst bed’s full temperature rise taking place at each level is a direct indication of the fraction of the total ethylene reaction that has taken place below the thermocouple level. 其中 characteristics在句中什么意思! 查看更多7个回答 . 1人已关注