图是人体血液循环示意图请据图回答下列问题1在心脏四腔中流着静脉血的是�和�.心脏内的血液能按照一定的方�流动而不能倒流的原因是心房和 Template




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tomski图是人体血液循环示意图请据图回答下列问题1在心脏四腔中流着静脉血的是�和�.心脏内的血液能按照一定的方�流动而不能倒流的原因是心房和 coloring