单选题：肠系膜上动脉根部阻塞完全不引起血运障碍的器官是（）

题目内容：

肠系膜上动脉根部阻塞完全不引起血运障碍的器官是（） A．十二指肠和胰
A．十二指肠和胰
B．空肠和回肠
B．空肠和回肠
C．升结肠和横结肠
C．升结肠和横结肠
D．降结肠和乙状结肠
D．降结肠和乙状结肠
E．十二指肠和空肠

参考答案：

答案解析：

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