下图为人体部分血液循环示意图数字表示人体内的某些器官或结构请分析回答1血管3内的血液只能按箭头方�流动而不能倒流的原因是该血管内 Template




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tomski下图为人体部分血液循环示意图数字表示人体内的某些器官或结构请分析回答1血管3内的血液只能按箭头方�流动而不能倒流的原因是该血管内 coloring