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【单选题】
关于肠梗阻的论述，下列哪种不正确
A.
绞窄性肠梗阻必然是急性肠梗阻
B.
慢性和不定肠梗阻多为单纯性肠梗阻
C.
无机械因素存在的肠梗阻多是动力性肠梗阻
D.
梗阻肠段有血循环障碍的就是绞窄性肠梗阻
E.
回肠梗阻属于高位肠梗阻
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