静脉的作用是收集血液返回心脏下列静脉的特点中与防止血液倒流相适应的结构特点主要是 A与心脏相通b管腔大其内表面有静脉瓣c管壁薄 Template




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tomski静脉的作用是收集血液返回心脏下列静脉的特点中与防止血液倒流相适应的结构特点主要是 a与心脏相通b管腔大其内表面有静脉瓣c管壁薄 coloring