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- 问题详情：Inlandwatersmaybegroupedintotwogeneralclasses:standingwatersandflowingwaters.Asisoftenthecase,theboundarybetweenthesetwoclassesisnotsharpandclear.Apondisanexampleofstandingwater.Butmostpondsarefedbyspringsorbrooksandmosthaveanoutlet.Thussomec...
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