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【单选题】
食管的位置及狭窄( )A.
于脊柱前方、气管后方下行
B.
第二个狭窄位于右主支气管跨越食管前方处
C.
与胸导管共同穿经膈的食管裂孔入腹腔
D.
颈段最长
E.
第3个狭窄位于食管末端，与贲门相接
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