upper slot Cutter knife to cut into the lower part of the convexification cancave corrugrted coilia completed the slotted;
上下槽通过上部切入下部凹完成瓦楞纸板缝;
upper slot Cutter knife to cut into the lower part of the convexification cancave corrugrted coilia completed the slotted;
上下槽通过上部切入下部凹完成瓦楞纸板缝;
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