粘土心墙土石围堰，采用导管排水能够使心墙截水槽开挖在干地施工，提高了粘土心墙填筑、碾压的质量，为小河流粘土心墙围堰施工提供了一......

AIM To retrospectively compare the outcomes of catheter drainage,urokinase and ozone in management of empyema.METHODS Re......