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【单选题】
关于上腔静脉梗阻时腹壁浅静脉的血流分布和方向,下列哪正确的是:A.
血流经脐静脉而入腹壁浅静脉流向四方
B.
脐水平以上的腹壁静脉血流向上,脐水平以下向下
C.
脐水平以下及脐水平以上的腹壁静脉血流方向均向上
D.
脐水平以上的上腹壁及胸壁浅静脉.脐水平以下的血流方向均
E.
脐水平以上的腹壁静脉自下向上经胸壁静脉和腋静脉而进入上腔静脉
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