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Blastin centrifugal pump of single stage type character pattern chemical tank cleaning method coccygeal nerves condition of integrability disapprovement exception-principle system Gushanian Stage maximum tolerance limit mussaenda parviflora miq. polymer-solvent preston's log-normal law RHLN tongbok (dongbog) valley white oaks vein-type orebody wang mai khon (sawankhalok) whack-up zero-order function