能说明生物群落在垂直方�上具有分层现象的是a.森林中有乔木层灌木层和草木层b.森林中�木的间隙有较多的灌木和草丛c.一片竹林中竹子高矮不一d Template




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tomski能说明生物群落在垂直方�上具有分层现象的是a.森林中有乔木层灌木层和草木层b.森林中�木的间隙有较多的灌木和草丛c.一片竹林中竹子高矮不一d coloring