它的排列范围就是图像明亮程度的梯度反映。
The tonal range of the image is graphed according to its brightness value.
研究结果表明，在阳极平均排列时，环形焦粒床所产生的热梯度最小，为最佳的焦粒焙烧方案。
The computational results show that the ring coke bed is the best method of the coke preheating which has the least thermal stress in the cathode when anodes are arranged averagely.
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