右图为人体血液循环示意图请据图回答1心脏有四个腔图中a是 2心脏四腔内由c到b由d到a都有 瓣膜它们可以保证血液定�流动 Template




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tomski右图为人体血液循环示意图请据图回答1心脏有四个腔图中a是 2心脏四腔内由c到b由d到a都有 瓣膜它们可以保证血液定�流动 coloring