| 摘要 |
The present invent describes a rubbing apparatus; the procedure begins when increasing the inundation capacity of the rubbing tray (2) while adding at least a layer of nets of low surface area (3) over the entrance toward the descending tubes (6, 12) located at the tray (2). The nets (3) extend upward by an equal distance between one and four times the depth of the descending tubes. The nets can rest over the upper edge of the descending tubes or over the net support between the upper portions of the lateral walls of the descending tube.
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