单项选择题
A.7mm B.6mm C.5mm D.4mm E.3mm
A.黏膜层、黏膜下层、肌层、浆膜层 B.黏膜层、黏膜下层、黏膜肌层、肌层、浆膜层 C.黏膜层、黏膜肌层、黏膜下层、固有肌层、浆膜层 D.黏膜层、黏膜肌层、浆膜层 E.黏膜层、肌层、浆膜层
A.十二指肠 B.空肠 C.回肠 D.回盲部 E.结肠