The mean flue temperature is affected by many factors and traditional control method is not satisfactory.
直行温度受多种因素的影响，传统的控制方法难以满足焦炉加热控制的要求。
The mean flue temperature is affected by many factors and it is difficult to control the temperature to require precision by the normal control methods.
直行温度受多种因素的影响，采用常规的控制方法难以将温度控制在要求的精度范围内。
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