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【单选题】
患者,男,62岁,因发热,呕吐,脱水,及腹胀而至医院诊治。X光腹壁平片显示肠梗阻征。经剖腹探查发现空肠的直小血管出现梗阻。空肠的直小血管发自下列哪条动脉A.
肠系膜上动脉
B.
回结肠动脉
C.
左结肠动脉
D.
胃网膜左动脉
E.
胰十二指肠下动脉
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