无论在任何一个网块的换网过程中，都至少有三块网在工作，实现连续不中断生产。
A least three filtration screens are in working position when a screen block is in the changing process, to realize continuous extrusion process.
无论在任何一个网块的换网过程中，都至少有三块网在工作，实现连续不中断生产。
A least three filtration screens are in working position when a screen block is in the changing process, to realize continuous extrusion process.
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