如图为人体血液循环的简单示意图1图中左心房与左心室间右心房与右心室间有瓣膜它的作用是 .2血液由右心室经a回到左心房的过程称为 Template




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tomski如图为人体血液循环的简单示意图1图中左心房与左心室间右心房与右心室间有瓣膜它的作用是 .2血液由右心室经a回到左心房的过程称为 coloring