如图是人体心脏的结构气体交换示意图请据图回答下列问题1在人的血液循环过程中血液只朝一个方�流动的原因是心脏和血管内具有防止血液倒流 Template




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tomski如图是人体心脏的结构气体交换示意图请据图回答下列问题1在人的血液循环过程中血液只朝一个方�流动的原因是心脏和血管内具有防止血液倒流 coloring