Pipe sinking drawing is analysed using continuous speed field and the equations of wall thickness variations in sinking drawing established.
利用连续速度场分析了圆管空拔过程，建立了空拔壁厚变化量计算式。
Pipe sinking drawing is analysed using continuous speed field and the equations of wall thickness variations in sinking drawing established.
利用连续速度场分析了圆管空拔过程，建立了空拔壁厚变化量计算式。
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