Inlandwatersmaybegroupedintotwogeneralclasses:standingw...
问题详情：Inlandwatersmaybegroupedintotwogeneralclasses:standingwatersandflowingwaters.Asisoftenthecase,theboundarybetweenthesetwoclassesisnotsharpandclear.Apondisanexampleofstandingwater.Butmostpondsar...