- 問題詳情:Inlandwatersmaybegroupedintotwogeneralclasses:standingwatersandflowingwaters.Asisoftenthecase,theboundarybetweenthesetwoclassesisnotsharpandclear.Apondisanexampleofstandingwater.Butmostpondsarefedbyspringsorbrooksandmosthaveanoutlet.Thussomec...
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