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【单选题】
肠系膜下动脉闭塞不致引起直肠黏膜坏死,其原因是 ( )
A.
可通过肠系膜上动脉的分支供血
B.
可通过髂内动脉分支直肠下动脉供血
C.
髂外动脉分支肛动脉也可供血
D.
可通过左结肠动脉供血
E.
肠系膜下动脉没有至直肠的分支
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