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Dust Removal Effect Of Machine Is Bad,Dust Emission Standard,Influence Effect Of Blasting Directly! Sound Arrester Is Not Good,Work Noise Is Loud,Effect Work Emotion,Produce Noisy Pollution! Equipment Doubling and Abrasive Resistance Of Wear Parts Is Not Hard,Change Regularly, The Cost Is So High! Impeller Placement Is Unreasonable,Produce Plenty Of Corner Of Impeller,Extend Workload! 网址 www.