| http://www.w3.org/ns/prov#value | - A preferred perforated plate is the one in which the surface of openings in the perforated plate facing the slurry suspensions is open in the direction other than the right angle to the direction where the self-weight of the solids is applied during and after the separation of the solids that is, the perforated plate has a structure projecting from its base plate.
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