人体内的血液在循环系统中只能按一定方�流动不能倒流在心脏中血液的流动方�只能是 A左心室→左心房→主动脉 b右心室→右心房→肺动脉 Template




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tomski人体内的血液在循环系统中只能按一定方�流动不能倒流在心脏中血液的流动方�只能是 a左心室→左心房→主动脉 b右心室→右心房→肺动脉 coloring